diff --git a/Razor.sln b/Razor.sln
index ed7243ac96..1d3fd090db 100644
--- a/Razor.sln
+++ b/Razor.sln
@@ -180,6 +180,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RazorSyntaxGenerator", "src
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Compiler Tests", "Compiler Tests", "{A5E2E4FA-6087-4C16-BB7A-89E23AA0F4E3}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Razor.Common.Test", "src\Razor\test\Microsoft.AspNetCore.Razor.Common.Test\Microsoft.AspNetCore.Razor.Common.Test.csproj", "{23E48E5E-91FC-421E-B122-C7D084FCE39A}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -756,6 +758,14 @@ Global
 		{A9F9B5E5-C5C2-4860-BE56-038C70ADBAC9}.Release|Any CPU.Build.0 = Release|Any CPU
 		{A9F9B5E5-C5C2-4860-BE56-038C70ADBAC9}.ReleaseNoVSIX|Any CPU.ActiveCfg = Release|Any CPU
 		{A9F9B5E5-C5C2-4860-BE56-038C70ADBAC9}.ReleaseNoVSIX|Any CPU.Build.0 = Release|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.DebugNoVSIX|Any CPU.ActiveCfg = Debug|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.DebugNoVSIX|Any CPU.Build.0 = Debug|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.ReleaseNoVSIX|Any CPU.ActiveCfg = Release|Any CPU
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A}.ReleaseNoVSIX|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -839,6 +849,7 @@ Global
 		{1360ABF4-752C-4069-84A9-8D1831281AF1} = {FB7C870E-A173-4F75-BE63-4EF39C79A759}
 		{97DE8703-467C-49A7-BCE4-42FF1FEC8AC2} = {FB7C870E-A173-4F75-BE63-4EF39C79A759}
 		{A9F9B5E5-C5C2-4860-BE56-038C70ADBAC9} = {FB7C870E-A173-4F75-BE63-4EF39C79A759}
+		{23E48E5E-91FC-421E-B122-C7D084FCE39A} = {92463391-81BE-462B-AC3C-78C6C760741F}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {0035341D-175A-4D05-95E6-F1C2785A1E26}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Microsoft.AspNetCore.Razor.Common.csproj b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Microsoft.AspNetCore.Razor.Common.csproj
index 7738d4b2b7..4061f333de 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Microsoft.AspNetCore.Razor.Common.csproj
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Microsoft.AspNetCore.Razor.Common.csproj
@@ -10,6 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="$(MicrosoftExtensionsPackageVersion)" />
+    <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="$(MicrosoftExtensionsPackageVersion)" />
     <PackageReference Include="Microsoft.VisualStudio.Telemetry" Version="$(MicrosoftVisualStudioTelemetryVersion)" />
     <PackageReference Include="Microsoft.VisualStudio.Threading" Version="$(MicrosoftVisualStudioThreadingPackageVersion)" />
     <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutablePackageVersion)" />
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.Policy.cs
new file mode 100644
index 0000000000..274a948325
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.Policy.cs
@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Immutable;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class ArrayBuilderPool<T>
+{
+    private class Policy : IPooledObjectPolicy<ImmutableArray<T>.Builder>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public ImmutableArray<T>.Builder Create() => ImmutableArray.CreateBuilder<T>();
+
+        public bool Return(ImmutableArray<T>.Builder builder)
+        {
+            var count = builder.Count;
+
+            builder.Clear();
+
+            if (count > DefaultPool.MaximumObjectSize)
+            {
+                builder.Capacity = DefaultPool.MaximumObjectSize;
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.cs
new file mode 100644
index 0000000000..83713f0c3c
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ArrayBuilderPool`1.cs
@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Immutable;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="ImmutableArray{T}.Builder"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class ArrayBuilderPool<T>
+{
+    public static readonly ObjectPool<ImmutableArray<T>.Builder> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<ImmutableArray<T>.Builder> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<ImmutableArray<T>.Builder> GetPooledObject(out ImmutableArray<T>.Builder builder)
+        => Default.GetPooledObject(out builder);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DefaultPool.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DefaultPool.cs
new file mode 100644
index 0000000000..66ef76360b
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DefaultPool.cs
@@ -0,0 +1,15 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static class DefaultPool
+{
+    public const int MaximumObjectSize = 512;
+
+    public static ObjectPool<T> Create<T>(IPooledObjectPolicy<T> policy)
+        where T : class
+        => new DefaultObjectPool<T>(policy, 20);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.Policy.cs
new file mode 100644
index 0000000000..75ab2c4114
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.Policy.cs
@@ -0,0 +1,31 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class DictionaryPool<TKey, TValue>
+    where TKey : notnull
+{
+    private class Policy : IPooledObjectPolicy<Dictionary<TKey, TValue>>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public Dictionary<TKey, TValue> Create() => new();
+
+        public bool Return(Dictionary<TKey, TValue> map)
+        {
+            var count = map.Count;
+
+            map.Clear();
+
+            return count <= DefaultPool.MaximumObjectSize;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.cs
new file mode 100644
index 0000000000..e8a41d289d
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/DictionaryPool`2.cs
@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="Dictionary{TKey, TValue}"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class DictionaryPool<TKey, TValue>
+    where TKey : notnull
+{
+    public static readonly ObjectPool<Dictionary<TKey, TValue>> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<Dictionary<TKey, TValue>> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<Dictionary<TKey, TValue>> GetPooledObject(out Dictionary<TKey, TValue> map)
+        => Default.GetPooledObject(out map);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.Policy.cs
new file mode 100644
index 0000000000..374490d08d
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.Policy.cs
@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class HashSetPool<T>
+{
+    private class Policy : IPooledObjectPolicy<HashSet<T>>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public HashSet<T> Create() => new();
+
+        public bool Return(HashSet<T> set)
+        {
+            var count = set.Count;
+
+            set.Clear();
+
+            if (count > DefaultPool.MaximumObjectSize)
+            {
+                set.TrimExcess();
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.cs
new file mode 100644
index 0000000000..ba4e0ff1a7
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/HashSetPool`1.cs
@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="HashSet{T}"/> instances that compares items using default equality.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class HashSetPool<T>
+{
+    public static readonly ObjectPool<HashSet<T>> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<HashSet<T>> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<HashSet<T>> GetPooledObject(out HashSet<T> set)
+        => Default.GetPooledObject(out set);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.Policy.cs
new file mode 100644
index 0000000000..40a7ffed79
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.Policy.cs
@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class ListPool<T>
+{
+    private class Policy : IPooledObjectPolicy<List<T>>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public List<T> Create() => new();
+
+        public bool Return(List<T> list)
+        {
+            var count = list.Count;
+
+            list.Clear();
+
+            if (count > DefaultPool.MaximumObjectSize)
+            {
+                list.TrimExcess();
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.cs
new file mode 100644
index 0000000000..7f9cc9d061
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ListPool`1.cs
@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="List{T}"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class ListPool<T>
+{
+    public static readonly ObjectPool<List<T>> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<List<T>> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<List<T>> GetPooledObject(out List<T> list)
+        => Default.GetPooledObject(out list);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObjectExtensions.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObjectExtensions.cs
new file mode 100644
index 0000000000..663986b97f
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObjectExtensions.cs
@@ -0,0 +1,99 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Diagnostics;
+using System.Text;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class PooledObjectExtensions
+{
+    public static PooledObject<ImmutableArray<T>.Builder> GetPooledObject<T>(this ObjectPool<ImmutableArray<T>.Builder> pool)
+        => new(pool);
+
+    public static PooledObject<ImmutableArray<T>.Builder> GetPooledObject<T>(
+        this ObjectPool<ImmutableArray<T>.Builder> pool,
+        out ImmutableArray<T>.Builder builder)
+    {
+        var pooledObject = pool.GetPooledObject();
+        builder = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<Dictionary<TKey, TValue>> GetPooledObject<TKey, TValue>(this ObjectPool<Dictionary<TKey, TValue>> pool)
+        where TKey : notnull
+        => new(pool);
+
+    public static PooledObject<Dictionary<TKey, TValue>> GetPooledObject<TKey, TValue>(
+        this ObjectPool<Dictionary<TKey, TValue>> pool,
+        out Dictionary<TKey, TValue> map)
+        where TKey : notnull
+    {
+        var pooledObject = pool.GetPooledObject();
+        map = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<HashSet<T>> GetPooledObject<T>(this ObjectPool<HashSet<T>> pool)
+        => new(pool);
+
+    public static PooledObject<HashSet<T>> GetPooledObject<T>(
+        this ObjectPool<HashSet<T>> pool,
+        out HashSet<T> set)
+    {
+        var pooledObject = pool.GetPooledObject();
+        set = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<List<T>> GetPooledObject<T>(this ObjectPool<List<T>> pool)
+        => new(pool);
+
+    public static PooledObject<List<T>> GetPooledObject<T>(
+        this ObjectPool<List<T>> pool,
+        out List<T> list)
+    {
+        var pooledObject = pool.GetPooledObject();
+        list = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<Stack<T>> GetPooledObject<T>(this ObjectPool<Stack<T>> pool)
+        => new(pool);
+
+    public static PooledObject<Stack<T>> GetPooledObject<T>(
+        this ObjectPool<Stack<T>> pool,
+        out Stack<T> stack)
+    {
+        var pooledObject = pool.GetPooledObject();
+        stack = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<Stopwatch> GetPooledObject(this ObjectPool<Stopwatch> pool)
+        => new(pool);
+
+    public static PooledObject<Stopwatch> GetPooledObject(
+        this ObjectPool<Stopwatch> pool,
+        out Stopwatch watch)
+    {
+        var pooledObject = pool.GetPooledObject();
+        watch = pooledObject.Object;
+        return pooledObject;
+    }
+
+    public static PooledObject<StringBuilder> GetPooledObject(this ObjectPool<StringBuilder> pool)
+        => new(pool);
+
+    public static PooledObject<StringBuilder> GetPooledObject(
+        this ObjectPool<StringBuilder> pool,
+        out StringBuilder builder)
+    {
+        var pooledObject = pool.GetPooledObject();
+        builder = pooledObject.Object;
+        return pooledObject;
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObject`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObject`1.cs
new file mode 100644
index 0000000000..be24601088
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/PooledObject`1.cs
@@ -0,0 +1,37 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+// Copied from https://github/dotnet/roslyn
+
+using System;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal struct PooledObject<T> : IDisposable
+    where T : class
+{
+    private readonly ObjectPool<T> _pool;
+    private T? _object;
+
+    // Because of how this API is intended to be used, we don't want the consumption code to have
+    // to deal with Object being a nullable reference type. Intead, the guarantee is that this is
+    // non-null until this is disposed.
+    public T Object => _object!;
+
+    public PooledObject(ObjectPool<T> pool)
+        : this()
+    {
+        _pool = pool;
+        _object = pool.Get();
+    }
+
+    public void Dispose()
+    {
+        if (_object is { } obj)
+        {
+            _pool.Return(obj);
+            _object = null;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.Policy.cs
new file mode 100644
index 0000000000..fa844038e5
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.Policy.cs
@@ -0,0 +1,36 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Razor.Utilities;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class ReferenceEqualityHashSetPool<T>
+{
+    private class Policy : IPooledObjectPolicy<HashSet<T>>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public HashSet<T> Create() => new(ReferenceEqualityComparer<T>.Instance);
+
+        public bool Return(HashSet<T> set)
+        {
+            var count = set.Count;
+
+            set.Clear();
+
+            if (count > DefaultPool.MaximumObjectSize)
+            {
+                set.TrimExcess();
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.cs
new file mode 100644
index 0000000000..c5a521cd0f
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/ReferenceEqualityHashSetPool`1.cs
@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="HashSet{T}"/> instances that compares items using reference equality.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class ReferenceEqualityHashSetPool<T>
+    where T : class
+{
+    public static readonly ObjectPool<HashSet<T>> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<HashSet<T>> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<HashSet<T>> GetPooledObject(out HashSet<T> set)
+        => Default.GetPooledObject(out set);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.Policy.cs
new file mode 100644
index 0000000000..2fed6370f8
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.Policy.cs
@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class StackPool<T>
+{
+    private class Policy : IPooledObjectPolicy<Stack<T>>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public Stack<T> Create() => new();
+
+        public bool Return(Stack<T> stack)
+        {
+            var count = stack.Count;
+
+            stack.Clear();
+
+            if (count > DefaultPool.MaximumObjectSize)
+            {
+                stack.TrimExcess();
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.cs
new file mode 100644
index 0000000000..b70af11217
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StackPool`1.cs
@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="Stack{T}"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class StackPool<T>
+{
+    public static readonly ObjectPool<Stack<T>> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<Stack<T>> GetPooledObject() => Default.GetPooledObject();
+
+    public static PooledObject<Stack<T>> GetPooledObject(out Stack<T> stack)
+        => Default.GetPooledObject(out stack);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.Policy.cs
new file mode 100644
index 0000000000..5844b7b0c2
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.Policy.cs
@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Diagnostics;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class StopwatchPool
+{
+    private class Policy : IPooledObjectPolicy<Stopwatch>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public Stopwatch Create() => new();
+
+        public bool Return(Stopwatch watch)
+        {
+            watch.Reset();
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.cs
new file mode 100644
index 0000000000..8479df1e92
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StopwatchPool.cs
@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Diagnostics;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="Stopwatch"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class StopwatchPool
+{
+    public static readonly ObjectPool<Stopwatch> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<Stopwatch> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<Stopwatch> GetPooledObject(out Stopwatch watch)
+        => Default.GetPooledObject(out watch);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.Policy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.Policy.cs
new file mode 100644
index 0000000000..1e7ac018ee
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.Policy.cs
@@ -0,0 +1,33 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Text;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class StringBuilderPool
+{
+    private class Policy : IPooledObjectPolicy<StringBuilder>
+    {
+        public static readonly Policy Instance = new();
+
+        private Policy()
+        {
+        }
+
+        public StringBuilder Create() => new();
+
+        public bool Return(StringBuilder builder)
+        {
+            builder.Clear();
+
+            if (builder.Capacity > DefaultPool.MaximumObjectSize)
+            {
+                builder.Capacity = DefaultPool.MaximumObjectSize;
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.cs
new file mode 100644
index 0000000000..75d78316c8
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringBuilderPool.cs
@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Text;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// A pool of <see cref="StringBuilder"/> instances.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class StringBuilderPool
+{
+    public static readonly ObjectPool<StringBuilder> Default = DefaultPool.Create(Policy.Instance);
+
+    public static PooledObject<StringBuilder> GetPooledObject()
+        => Default.GetPooledObject();
+
+    public static PooledObject<StringBuilder> GetPooledObject(out StringBuilder builder)
+        => Default.GetPooledObject(out builder);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalIgnoreCasePolicy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalIgnoreCasePolicy.cs
new file mode 100644
index 0000000000..736e28a96c
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalIgnoreCasePolicy.cs
@@ -0,0 +1,32 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class StringDictionaryPool<TValue>
+{
+    private class OrdinalIgnoreCasePolicy : IPooledObjectPolicy<Dictionary<string, TValue>>
+    {
+        public static readonly OrdinalIgnoreCasePolicy Instance = new();
+
+        private OrdinalIgnoreCasePolicy()
+        {
+        }
+
+        public Dictionary<string, TValue> Create() => new(StringComparer.OrdinalIgnoreCase);
+
+        public bool Return(Dictionary<string, TValue> map)
+        {
+            var count = map.Count;
+
+            map.Clear();
+
+            // If the map grew too large, don't return it to the pool.
+            return count <= DefaultPool.MaximumObjectSize;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalPolicy.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalPolicy.cs
new file mode 100644
index 0000000000..3eca68439a
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.OrdinalPolicy.cs
@@ -0,0 +1,32 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+internal static partial class StringDictionaryPool<TValue>
+{
+    private class OrdinalPolicy : IPooledObjectPolicy<Dictionary<string, TValue>>
+    {
+        public static readonly OrdinalPolicy Instance = new();
+
+        private OrdinalPolicy()
+        {
+        }
+
+        public Dictionary<string, TValue> Create() => new(StringComparer.Ordinal);
+
+        public bool Return(Dictionary<string, TValue> map)
+        {
+            var count = map.Count;
+
+            map.Clear();
+
+            // If the map grew too large, don't return it to the pool.
+            return count <= DefaultPool.MaximumObjectSize;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.cs
new file mode 100644
index 0000000000..33cc544688
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/PooledObjects/StringDictionaryPool`1.cs
@@ -0,0 +1,37 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.AspNetCore.Razor.PooledObjects;
+
+/// <summary>
+/// Pooled <see cref="Dictionary{TKey, TValue}"/> instances when the key is of type <see cref="string"/>.
+/// </summary>
+/// 
+/// <remarks>
+/// Instances originating from this pool are intended to be short-lived and are suitable
+/// for temporary work. Do not return them as the results of methods or store them in fields.
+/// </remarks>
+internal static partial class StringDictionaryPool<TValue>
+{
+    public static readonly ObjectPool<Dictionary<string, TValue>> Ordinal = ObjectPool.Create(OrdinalPolicy.Instance);
+    public static readonly ObjectPool<Dictionary<string, TValue>> OrdinalIgnoreCase = ObjectPool.Create(OrdinalIgnoreCasePolicy.Instance);
+
+    public static PooledObject<Dictionary<string, TValue>> GetPooledObject()
+        => Ordinal.GetPooledObject();
+
+    public static PooledObject<Dictionary<string, TValue>> GetPooledObject(out Dictionary<string, TValue> map)
+        => Ordinal.GetPooledObject(out map);
+
+    public static PooledObject<Dictionary<string, TValue>> GetPooledObject(bool ignoreCase)
+        => ignoreCase
+            ? OrdinalIgnoreCase.GetPooledObject()
+            : Ordinal.GetPooledObject();
+
+    public static PooledObject<Dictionary<string, TValue>> GetPooledObject(bool ignoreCase, out Dictionary<string, TValue> map)
+        => ignoreCase
+            ? OrdinalIgnoreCase.GetPooledObject(out map)
+            : Ordinal.GetPooledObject(out map);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Properties/AssemblyInfo.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Properties/AssemblyInfo.cs
index 4628f89ea0..6e405aa15c 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Properties/AssemblyInfo.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Properties/AssemblyInfo.cs
@@ -3,6 +3,7 @@
 
 using System.Runtime.CompilerServices;
 
+[assembly: InternalsVisibleTo("Microsoft.AspNetCore.Razor.Common.Test, PublicKey=0024000004800000940000000602000000240000525341310004000001000100f33a29044fa9d740c9b3213a93e57c84b472c84e0b8a0e1ae48e67a9f8f6de9d5f7f3d52ac23e48ac51801f1dc950abe901da34d2a9e3baadb141a17c77ef3c565dd5ee5054b91cf63bb3c6ab83f72ab3aafe93d0fc3c2348b764fafb0b1c0733de51459aeab46580384bf9d74c4e28164b7cde247f891ba07891c9d872ad2bb")]
 [assembly: InternalsVisibleTo("Microsoft.AspNetCore.Razor.LanguageServer, PublicKey=0024000004800000940000000602000000240000525341310004000001000100f33a29044fa9d740c9b3213a93e57c84b472c84e0b8a0e1ae48e67a9f8f6de9d5f7f3d52ac23e48ac51801f1dc950abe901da34d2a9e3baadb141a17c77ef3c565dd5ee5054b91cf63bb3c6ab83f72ab3aafe93d0fc3c2348b764fafb0b1c0733de51459aeab46580384bf9d74c4e28164b7cde247f891ba07891c9d872ad2bb")]
 [assembly: InternalsVisibleTo("Microsoft.AspNetCore.Razor.LanguageServer.Common, PublicKey=0024000004800000940000000602000000240000525341310004000001000100f33a29044fa9d740c9b3213a93e57c84b472c84e0b8a0e1ae48e67a9f8f6de9d5f7f3d52ac23e48ac51801f1dc950abe901da34d2a9e3baadb141a17c77ef3c565dd5ee5054b91cf63bb3c6ab83f72ab3aafe93d0fc3c2348b764fafb0b1c0733de51459aeab46580384bf9d74c4e28164b7cde247f891ba07891c9d872ad2bb")]
 [assembly: InternalsVisibleTo("Microsoft.AspNetCore.Razor.LanguageServer.Common.Test, PublicKey=0024000004800000940000000602000000240000525341310004000001000100f33a29044fa9d740c9b3213a93e57c84b472c84e0b8a0e1ae48e67a9f8f6de9d5f7f3d52ac23e48ac51801f1dc950abe901da34d2a9e3baadb141a17c77ef3c565dd5ee5054b91cf63bb3c6ab83f72ab3aafe93d0fc3c2348b764fafb0b1c0733de51459aeab46580384bf9d74c4e28164b7cde247f891ba07891c9d872ad2bb")]
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/StringBuilderExtensions.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/StringBuilderExtensions.cs
new file mode 100644
index 0000000000..529e24c0ba
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/StringBuilderExtensions.cs
@@ -0,0 +1,17 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Text;
+
+namespace Microsoft.AspNetCore.Razor;
+
+internal static class StringBuilderExtensions
+{
+    public static void SetCapacityIfLarger(this StringBuilder builder, int newCapacity)
+    {
+        if (builder.Capacity < newCapacity)
+        {
+            builder.Capacity = newCapacity;
+        }
+    }
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Utilities/ReferenceEqualityComparer.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Utilities/ReferenceEqualityComparer.cs
new file mode 100644
index 0000000000..d8643e51ff
--- /dev/null
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.Common/Utilities/ReferenceEqualityComparer.cs
@@ -0,0 +1,23 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+namespace Microsoft.AspNetCore.Razor.Utilities;
+
+internal sealed class ReferenceEqualityComparer<T> : IEqualityComparer<T>
+    where T : class
+{
+    public static readonly ReferenceEqualityComparer<T> Instance = new();
+
+    private ReferenceEqualityComparer()
+    {
+    }
+
+    bool IEqualityComparer<T>.Equals(T? x, T? y)
+        => ReferenceEquals(x, y);
+
+    int IEqualityComparer<T>.GetHashCode(T obj)
+        => RuntimeHelpers.GetHashCode(obj);
+}
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/DocumentPresentation/TextDocumentUriPresentationEndpoint.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/DocumentPresentation/TextDocumentUriPresentationEndpoint.cs
index 5f9fb4e976..07fde3c2c3 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/DocumentPresentation/TextDocumentUriPresentationEndpoint.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/DocumentPresentation/TextDocumentUriPresentationEndpoint.cs
@@ -4,7 +4,6 @@
 using System;
 using System.IO;
 using System.Linq;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
@@ -12,6 +11,7 @@ using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.Extensions;
 using Microsoft.AspNetCore.Razor.LanguageServer.ProjectSystem;
 using Microsoft.AspNetCore.Razor.LanguageServer.Protocol;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.Extensions.Logging;
@@ -165,7 +165,8 @@ internal class TextDocumentUriPresentationEndpoint : AbstractTextDocumentPresent
 
         // TODO: Add @using statements if required, or fully qualify (GetTypeName())
 
-        var sb = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var sb);
+
         sb.Append('<');
         sb.Append(typeName);
 
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Formatting/CSharpOnTypeFormattingPass.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Formatting/CSharpOnTypeFormattingPass.cs
index 4e6b065ec8..fdafd1b808 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Formatting/CSharpOnTypeFormattingPass.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Formatting/CSharpOnTypeFormattingPass.cs
@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
@@ -14,6 +13,7 @@ using Microsoft.AspNetCore.Razor.Language.Syntax;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;
 using Microsoft.AspNetCore.Razor.LanguageServer.Extensions;
 using Microsoft.AspNetCore.Razor.LanguageServer.Protocol;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Extensions;
@@ -401,7 +401,10 @@ internal class CSharpOnTypeFormattingPass : CSharpFormattingPassBase
 
     private static string PrependLines(string text, string newLine, int count)
     {
-        var builder = new StringBuilder((newLine.Length * count) + text.Length);
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
+        builder.SetCapacityIfLarger((newLine.Length * count) + text.Length);
+
         for (var i = 0; i < count; i++)
         {
             builder.Append(newLine);
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/SourceTextDiffer.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/SourceTextDiffer.cs
index 600836b406..4718ec10ad 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/SourceTextDiffer.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/SourceTextDiffer.cs
@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis.Text;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer;
@@ -84,7 +84,9 @@ internal class SourceTextDiffer : TextDiffer
 
         var start = 0;
         var end = 0;
-        var builder = new StringBuilder();
+
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
         foreach (var edit in edits)
         {
             var startPosition = _lineDiffOnly ? OldText.Lines[edit.Position].Start : edit.Position;
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultLSPTagHelperTooltipFactory.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultLSPTagHelperTooltipFactory.cs
index 07ccbc53c3..3aeed21dff 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultLSPTagHelperTooltipFactory.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultLSPTagHelperTooltipFactory.cs
@@ -5,6 +5,7 @@ using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis.Razor.Tooltip;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
@@ -36,7 +37,8 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
         //
         // Additional description infos result in a triple `---` to separate the markdown entries.
 
-        var descriptionBuilder = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var descriptionBuilder);
+
         for (var i = 0; i < associatedTagHelperInfos.Count; i++)
         {
             var descriptionInfo = associatedTagHelperInfos[i];
@@ -70,6 +72,7 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
             Kind = markupKind,
             Value = descriptionBuilder.ToString(),
         };
+
         return true;
     }
 
@@ -97,7 +100,8 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
         //
         // Additional description infos result in a triple `---` to separate the markdown entries.
 
-        var descriptionBuilder = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var descriptionBuilder);
+
         for (var i = 0; i < associatedAttributeInfos.Count; i++)
         {
             var descriptionInfo = associatedAttributeInfos[i];
@@ -117,11 +121,11 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
             var reducedReturnTypeName = ReduceTypeName(returnTypeName);
             descriptionBuilder.Append(reducedReturnTypeName);
             StartOrEndBold(descriptionBuilder, markupKind);
-            descriptionBuilder.Append(" ");
+            descriptionBuilder.Append(' ');
             var tagHelperTypeName = descriptionInfo.TypeName;
             var reducedTagHelperTypeName = ReduceTypeName(tagHelperTypeName);
             descriptionBuilder.Append(reducedTagHelperTypeName);
-            descriptionBuilder.Append(".");
+            descriptionBuilder.Append('.');
             StartOrEndBold(descriptionBuilder, markupKind);
             descriptionBuilder.Append(descriptionInfo.PropertyName);
             StartOrEndBold(descriptionBuilder, markupKind);
@@ -143,6 +147,7 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
             Kind = markupKind,
             Value = descriptionBuilder.ToString(),
         };
+
         return true;
     }
 
@@ -155,7 +160,10 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
         // it'll be serialized as html (wont show).
         summaryContent = summaryContent.Trim();
         var crefMatches = ExtractCrefMatches(summaryContent);
-        var summaryBuilder = new StringBuilder(summaryContent);
+
+        using var _ = StringBuilderPool.GetPooledObject(out var summaryBuilder);
+
+        summaryBuilder.Append(summaryContent);
 
         for (var i = crefMatches.Count - 1; i >= 0; i--)
         {
@@ -175,11 +183,11 @@ internal class DefaultLSPTagHelperTooltipFactory : LSPTagHelperTooltipFactory
         return finalSummaryContent;
     }
 
-    private void StartOrEndBold(StringBuilder stringBuilder, MarkupKind markupKind)
+    private static void StartOrEndBold(StringBuilder builder, MarkupKind markupKind)
     {
         if (markupKind == MarkupKind.Markdown)
         {
-            stringBuilder.Append("**");
+            builder.Append("**");
         }
     }
 }
diff --git a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultVSLSPTagHelperTooltipFactory.cs b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultVSLSPTagHelperTooltipFactory.cs
index 553bb98a36..7a245ea689 100644
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultVSLSPTagHelperTooltipFactory.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Tooltip/DefaultVSLSPTagHelperTooltipFactory.cs
@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis.Razor.Tooltip;
 using Microsoft.VisualStudio.Core.Imaging;
 using Microsoft.VisualStudio.Text.Adornments;
@@ -243,7 +244,8 @@ internal class DefaultVSLSPTagHelperTooltipFactory : VSLSPTagHelperTooltipFactor
 
     private static void ClassifyReducedTypeName(List<ClassifiedTextRun> runs, string reducedTypeName)
     {
-        var currentTextRun = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var currentTextRun);
+
         for (var i = 0; i < reducedTypeName.Length; i++)
         {
             var ch = reducedTypeName[i];
@@ -352,7 +354,8 @@ internal class DefaultVSLSPTagHelperTooltipFactory : VSLSPTagHelperTooltipFactor
             return;
         }
 
-        var currentTextRun = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var currentTextRun);
+
         var currentCrefMatchIndex = 0;
         var currentCodeMatchIndex = 0;
         for (var i = 0; i < summaryContent.Length; i++)
@@ -360,7 +363,7 @@ internal class DefaultVSLSPTagHelperTooltipFactory : VSLSPTagHelperTooltipFactor
             // If we made it through all the crefs and code matches, add the rest of the text and break out of the loop.
             if (currentCrefMatchIndex == crefMatches.Count && currentCodeMatchIndex == codeMatches.Count)
             {
-                currentTextRun.Append(summaryContent.Substring(i));
+                currentTextRun.Append(summaryContent[i..]);
                 break;
             }
 
diff --git a/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents.csproj b/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents.csproj
index f5e8658329..e4293f0517 100644
--- a/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents.csproj
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents/Microsoft.CodeAnalysis.Remote.Razor.CoreComponents.csproj
@@ -29,6 +29,7 @@
       <_PublishedFiles Include="$(PublishDir)**\Microsoft.CodeAnalysis.Remote.Razor.*" Exclude="@(_ExcludedFiles)"/>
       <_PublishedFiles Include="$(PublishDir)**\Microsoft.AspNetCore.*" />
       <_PublishedFiles Include="$(PublishDir)**\Microsoft.Extensions.Logging.Abstractions.dll" />
+      <_PublishedFiles Include="$(PublishDir)**\Microsoft.Extensions.ObjectPool.dll" />
 
       <_PublishedFiles Remove="@(_PublishedFiles)" Condition="'%(Extension)' == '.pdb'" />
       <_PublishedFiles Remove="@(_PublishedFiles)" Condition="'%(Extension)' == '.xml'" />
diff --git a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Microsoft.VisualStudio.Mac.RazorAddin.csproj b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Microsoft.VisualStudio.Mac.RazorAddin.csproj
index 3ee2194d91..e0362bb5c9 100644
--- a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Microsoft.VisualStudio.Mac.RazorAddin.csproj
+++ b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Microsoft.VisualStudio.Mac.RazorAddin.csproj
@@ -81,6 +81,7 @@
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.AspNetCore.Razor.LanguageServer.Common\$(Configuration)\net472\Microsoft.AspNetCore.Razor.LanguageServer.Common.dll" />
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.AspNetCore.Razor.LanguageServer.Protocol\$(Configuration)\net472\Microsoft.AspNetCore.Razor.LanguageServer.Protocol.dll" />
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.AspNetCore.Razor.LanguageServer\$(Configuration)\net472\Microsoft.AspNetCore.Razor.LanguageServer.dll" />
+    <MPackFile Include="$(ArtifactsBinDir)Microsoft.VisualStudio.Mac.RazorAddin\$(Configuration)\net472\Microsoft.Extensions.ObjectPool.dll" />
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.VisualStudio.Mac.RazorAddin\$(Configuration)\net472\Microsoft.Extensions.Options.dll" />
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.VisualStudio.Mac.RazorAddin\$(Configuration)\net472\Microsoft.Extensions.Primitives.dll" />
     <MPackFile Include="$(ArtifactsBinDir)Microsoft.VisualStudio.Mac.RazorAddin\$(Configuration)\net472\Microsoft.Extensions.DependencyInjection.dll" />
diff --git a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Properties/_Manifest.addin.xml b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Properties/_Manifest.addin.xml
index 738d6e40e6..690b6172d5 100644
--- a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Properties/_Manifest.addin.xml
+++ b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/Properties/_Manifest.addin.xml
@@ -17,6 +17,7 @@
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.dll" />
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.Common.dll" />
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.Protocol.dll" />
+    <Import assembly="Microsoft.Extensions.ObjectPool.dll" />
     <Import assembly="Microsoft.Extensions.Options.dll" />
     <Import assembly="Microsoft.Extensions.Primitives.dll" />
     <Import assembly="Microsoft.Extensions.DependencyInjection.dll" />
diff --git a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/mpack/addin.info b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/mpack/addin.info
index b28c0dece6..36e468972b 100644
--- a/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/mpack/addin.info
+++ b/src/Razor/src/Microsoft.VisualStudio.Mac.RazorAddin/mpack/addin.info
@@ -17,6 +17,7 @@
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.dll" />
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.Common.dll" />
     <Import assembly="Microsoft.AspNetCore.Razor.LanguageServer.Protocol.dll" />
+    <Import assembly="Microsoft.Extensions.ObjectPool.dll" />
     <Import assembly="Microsoft.Extensions.Options.dll" />
     <Import assembly="Microsoft.Extensions.Primitives.dll" />
     <Import assembly="Microsoft.Extensions.DependencyInjection.dll" />
diff --git a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyBindingRedirects.cs b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyBindingRedirects.cs
index 6b0d918877..0947414cf4 100644
--- a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyBindingRedirects.cs
+++ b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyBindingRedirects.cs
@@ -7,55 +7,62 @@ using Microsoft.VisualStudio.Shell;
     AssemblyName = "Microsoft.Extensions.Logging.Abstractions",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.Logging",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.DependencyInjection",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.DependencyInjection.Abstractions",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
+    NewVersion = "6.0.0.0")]
+[assembly: ProvideBindingRedirection(
+    AssemblyName = "Microsoft.Extensions.ObjectPool",
+    GenerateCodeBase = true,
+    PublicKeyToken = "adb9793829ddae60",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.Options",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.Configuration.Abstractions",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.Configuration",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
 [assembly: ProvideBindingRedirection(
     AssemblyName = "Microsoft.Extensions.Primitives",
     GenerateCodeBase = true,
     PublicKeyToken = "adb9793829ddae60",
-    OldVersionLowerBound = "2.0.0.0",
-    OldVersionUpperBound = "2.0.0.0",
+    OldVersionLowerBound = "0.0.0.0",
+    OldVersionUpperBound = "6.0.0.0",
     NewVersion = "6.0.0.0")]
diff --git a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyCodeBases.cs b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyCodeBases.cs
index 5cb42e4405..bd0ab4ad27 100644
--- a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyCodeBases.cs
+++ b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/AssemblyCodeBases.cs
@@ -9,6 +9,7 @@ using Microsoft.VisualStudio.Shell;
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\OmniSharp.Extensions.LanguageServer.dll")]
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\OmniSharp.Extensions.LanguageServer.Shared.dll")]
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\Microsoft.CommonLanguageServerProtocol.Framework.dll")]
+[assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\Microsoft.Extensions.ObjectPool.dll")]
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\Microsoft.Extensions.Options.dll")]
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\Microsoft.Extensions.Primitives.dll")]
 [assembly: ProvideCodeBase(CodeBase = @"$PackageFolder$\Microsoft.Extensions.DependencyInjection.dll")]
diff --git a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/Microsoft.VisualStudio.RazorExtension.csproj b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/Microsoft.VisualStudio.RazorExtension.csproj
index 862677393e..6f5bfa5f9c 100644
--- a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/Microsoft.VisualStudio.RazorExtension.csproj
+++ b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/Microsoft.VisualStudio.RazorExtension.csproj
@@ -143,6 +143,7 @@
     <RazorNgendVSIXSourceItem Include="$(OutputPath)OmniSharp.Extensions.LanguageProtocol.dll" />
     <RazorNgendVSIXSourceItem Include="$(OutputPath)OmniSharp.Extensions.LanguageServer.dll" />
     <RazorNgendVSIXSourceItem Include="$(OutputPath)OmniSharp.Extensions.LanguageServer.Shared.dll" />
+    <RazorNgendVSIXSourceItem Include="$(OutputPath)Microsoft.Extensions.ObjectPool.dll" />
     <RazorNgendVSIXSourceItem Include="$(OutputPath)Microsoft.Extensions.Options.dll" />
     <RazorNgendVSIXSourceItem Include="$(OutputPath)Microsoft.Extensions.Options.ConfigurationExtensions.dll" />
     <RazorNgendVSIXSourceItem Include="$(OutputPath)Microsoft.Extensions.Primitives.dll" />
diff --git a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/source.extension.vsixmanifest b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/source.extension.vsixmanifest
index 48a1e8004c..5cea67313e 100644
--- a/src/Razor/src/Microsoft.VisualStudio.RazorExtension/source.extension.vsixmanifest
+++ b/src/Razor/src/Microsoft.VisualStudio.RazorExtension/source.extension.vsixmanifest
@@ -42,6 +42,7 @@
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="OmniSharp.Extensions.LanguageServer.Shared.dll" />
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.Extensions.Configuration.Binder.dll" />
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.CommonLanguageServerProtocol.Framework.dll" />
+    <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.Extensions.ObjectPool.dll" />
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.Extensions.Options.dll" />
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.Extensions.Options.ConfigurationExtensions.dll" />
     <Asset Type="Microsoft.VisualStudio.Assembly" Path="Microsoft.Extensions.Primitives.dll" />
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/Microsoft.AspNetCore.Razor.Common.Test.csproj b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/Microsoft.AspNetCore.Razor.Common.Test.csproj
new file mode 100644
index 0000000000..98701a9306
--- /dev/null
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/Microsoft.AspNetCore.Razor.Common.Test.csproj
@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>$(DefaultNetCoreTargetFramework);$(DefaultNetFxTargetFramework)</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Microsoft.AspNetCore.Razor.Common\Microsoft.AspNetCore.Razor.Common.csproj" />
+    <ProjectReference Include="..\Microsoft.AspNetCore.Razor.Test.Common\Microsoft.AspNetCore.Razor.Test.Common.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/XunitAssemblyInfo.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/XunitAssemblyInfo.cs
new file mode 100644
index 0000000000..3417e66389
--- /dev/null
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/XunitAssemblyInfo.cs
@@ -0,0 +1,6 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using Xunit;
+
+[assembly: CollectionBehavior(CollectionBehavior.CollectionPerAssembly, DisableTestParallelization = true)]
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/xunit.runner.json b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/xunit.runner.json
new file mode 100644
index 0000000000..4b6534f94d
--- /dev/null
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Common.Test/xunit.runner.json
@@ -0,0 +1,5 @@
+{
+  "methodDisplay": "method",
+  "shadowCopy": false,
+  "parallelizeTestCollections": false
+}
\ No newline at end of file
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Semantic/SemanticTokenTestBase.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Semantic/SemanticTokenTestBase.cs
index a1c804ab35..18ab72416f 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Semantic/SemanticTokenTestBase.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Semantic/SemanticTokenTestBase.cs
@@ -14,6 +14,7 @@ using Microsoft.AspNetCore.Razor.LanguageServer.Completion;
 using Microsoft.AspNetCore.Razor.LanguageServer.Extensions;
 using Microsoft.AspNetCore.Razor.LanguageServer.Semantic.Models;
 using Microsoft.AspNetCore.Razor.LanguageServer.Test.Common;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Extensions;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
@@ -159,7 +160,8 @@ public abstract class SemanticTokenTestBase : TagHelperServiceTestBase
 
     private static void GenerateSemanticBaseline(IEnumerable<int>? actual, string baselineFileName)
     {
-        var builder = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
         if (actual != null)
         {
             var actualArray = actual.ToArray();
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/CompilationFailedException.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/CompilationFailedException.cs
index 70dd202c57..6b6ab9c35e 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/CompilationFailedException.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/CompilationFailedException.cs
@@ -6,6 +6,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis;
 using Xunit.Sdk;
 
@@ -27,7 +28,8 @@ public class CompilationFailedException : XunitException
     {
         get
         {
-            var builder = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
             builder.AppendLine("Compilation failed: ");
 
             var syntaxTreesWithErrors = new HashSet<SyntaxTree>();
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/IntermediateNodeVerifier.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/IntermediateNodeVerifier.cs
index 4198239751..84fafd8193 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/IntermediateNodeVerifier.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/IntermediateNodeVerifier.cs
@@ -7,8 +7,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Text;
 using Microsoft.AspNetCore.Razor.Language.Intermediate;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Xunit;
 using Xunit.Sdk;
 
@@ -242,7 +242,8 @@ public static class IntermediateNodeVerifier
 
             private static string Format(IntermediateNode[] ancestors, string expected, string actual, string userMessage)
             {
-                var builder = new StringBuilder();
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
                 builder.AppendLine(userMessage);
                 builder.AppendLine();
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs
index d04abc0241..d40bad5b24 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs
@@ -9,9 +9,9 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.InteropServices;
-using System.Text;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Razor.Language.CodeGeneration;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.AspNetCore.Razor.Test.Common.Mef;
 using Microsoft.CodeAnalysis;
@@ -398,7 +398,8 @@ public class RazorIntegrationTestBase : TestBase
         {
             get
             {
-                var builder = new StringBuilder();
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
                 builder.AppendLine("Compilation failed: ");
 
                 var diagnostics = Compilation.GetDiagnostics();
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/SourceMappingsSerializer.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/SourceMappingsSerializer.cs
index 1ce0644c0b..b5e40e5550 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/SourceMappingsSerializer.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/SourceMappingsSerializer.cs
@@ -4,6 +4,7 @@
 #nullable disable
 
 using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 
 namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests;
 
@@ -11,7 +12,8 @@ public static class SourceMappingsSerializer
 {
     public static string Serialize(RazorCSharpDocument csharpDocument, RazorSourceDocument sourceDocument)
     {
-        var builder = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
         var charBuffer = new char[sourceDocument.Length];
         sourceDocument.CopyTo(0, charBuffer, 0, sourceDocument.Length);
         var sourceContent = new string(charBuffer);
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Intermediate/IntermediateNodeAssert.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Intermediate/IntermediateNodeAssert.cs
index 2dd19ab662..6e308a40c9 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Intermediate/IntermediateNodeAssert.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Intermediate/IntermediateNodeAssert.cs
@@ -5,8 +5,8 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 using Microsoft.AspNetCore.Razor.Language.Extensions;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Xunit;
 using Xunit.Sdk;
 
@@ -99,7 +99,9 @@ public static class IntermediateNodeAssert
         try
         {
             var html = Assert.IsType<HtmlContentIntermediateNode>(node);
-            var content = new StringBuilder();
+
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < html.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(html.Children[i]);
@@ -120,7 +122,9 @@ public static class IntermediateNodeAssert
         try
         {
             var statement = Assert.IsType<CSharpCodeIntermediateNode>(node);
-            var content = new StringBuilder();
+
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < statement.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(statement.Children[i]);
@@ -207,7 +211,8 @@ public static class IntermediateNodeAssert
 
         try
         {
-            var content = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < attributeValue.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(attributeValue.Children[i]);
@@ -230,7 +235,8 @@ public static class IntermediateNodeAssert
 
         try
         {
-            var content = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < attributeValue.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(attributeValue.Children[i]);
@@ -253,7 +259,8 @@ public static class IntermediateNodeAssert
         {
             var cSharp = Assert.IsType<CSharpExpressionIntermediateNode>(node);
 
-            var content = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < cSharp.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(cSharp.Children[i]);
@@ -274,7 +281,9 @@ public static class IntermediateNodeAssert
         try
         {
             var beginNode = Assert.IsType<CSharpCodeIntermediateNode>(node);
-            var content = new StringBuilder();
+
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < beginNode.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(beginNode.Children[i]);
@@ -295,7 +304,9 @@ public static class IntermediateNodeAssert
         try
         {
             var endNode = Assert.IsType<CSharpCodeIntermediateNode>(node);
-            var content = new StringBuilder();
+
+            using var _ = StringBuilderPool.GetPooledObject(out var content);
+
             for (var i = 0; i < endNode.Children.Count; i++)
             {
                 var token = Assert.IsType<IntermediateToken>(endNode.Children[i]);
@@ -458,7 +469,8 @@ public static class IntermediateNodeAssert
 
         private static string Format(IntermediateNode[] ancestors, IEnumerable<IntermediateNode> nodes, string userMessage)
         {
-            var builder = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
             builder.AppendLine(userMessage);
             builder.AppendLine();
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/ClassifiedSpan/ClassifiedSpanVerifier.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/ClassifiedSpan/ClassifiedSpanVerifier.cs
index 77c1c27d50..66e2adb175 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/ClassifiedSpan/ClassifiedSpanVerifier.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/ClassifiedSpan/ClassifiedSpanVerifier.cs
@@ -5,7 +5,7 @@
 
 using System;
 using System.IO;
-using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Xunit;
 using Xunit.Sdk;
 
@@ -90,7 +90,8 @@ internal class ClassifiedSpanVerifier
 
             private static string Format(string expected, string actual, string userMessage)
             {
-                var builder = new StringBuilder();
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
                 builder.AppendLine(userMessage);
                 builder.AppendLine();
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeVerifier.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeVerifier.cs
index 31e5ab9a52..6565b37f1b 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeVerifier.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeVerifier.cs
@@ -7,8 +7,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Text;
 using Microsoft.AspNetCore.Razor.Language.Syntax;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Xunit;
 using Xunit.Sdk;
 
@@ -263,7 +263,8 @@ public static class SyntaxNodeVerifier
 
             private static string Format(SyntaxNode[] ancestors, string expected, string actual, string userMessage)
             {
-                var builder = new StringBuilder();
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
                 builder.AppendLine(userMessage);
                 builder.AppendLine();
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeWriter.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeWriter.cs
index 4ffb15d494..94b639e172 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeWriter.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/SyntaxNodeWriter.cs
@@ -8,6 +8,7 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using Microsoft.AspNetCore.Razor.Language.Legacy;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 
 namespace Microsoft.AspNetCore.Razor.Language.Syntax;
 
@@ -113,7 +114,9 @@ internal class SyntaxNodeWriter : SyntaxRewriter
             return;
         }
 
-        var builder = new StringBuilder("Directive:{");
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
+        builder.Append("Directive:{");
         builder.Append(node.DirectiveDescriptor.Directive);
         builder.Append(';');
         builder.Append(node.DirectiveDescriptor.Kind);
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/TagHelperSpan/TagHelperSpanVerifier.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/TagHelperSpan/TagHelperSpanVerifier.cs
index 37afb419f2..68f4891177 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/TagHelperSpan/TagHelperSpanVerifier.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/Legacy/TagHelperSpan/TagHelperSpanVerifier.cs
@@ -5,7 +5,7 @@
 
 using System;
 using System.IO;
-using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Xunit;
 using Xunit.Sdk;
 
@@ -90,7 +90,8 @@ internal class TagHelperSpanVerifier
 
             private static string Format(string expected, string actual, string userMessage)
             {
-                var builder = new StringBuilder();
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
                 builder.AppendLine(userMessage);
                 builder.AppendLine();
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Mef/TestComposition.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Mef/TestComposition.cs
index 4b99171815..96e545c454 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Mef/TestComposition.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Mef/TestComposition.cs
@@ -6,7 +6,7 @@ using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 using System.Reflection;
-using System.Text;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.VisualStudio.Composition;
 using Roslyn.Utilities;
 
@@ -225,7 +225,8 @@ public HostServices GetHostServices()
     {
         var configuration = CompositionConfiguration.Create(GetCatalog());
 
-        var sb = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var sb);
+
         foreach (var errorGroup in configuration.CompositionErrors)
         {
             foreach (var error in errorGroup)
diff --git a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/CodeFoldingTests.cs b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/CodeFoldingTests.cs
index 3394d2cb2b..f74f57faee 100644
--- a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/CodeFoldingTests.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/CodeFoldingTests.cs
@@ -3,8 +3,8 @@
 
 using System.Collections.Immutable;
 using System.Linq;
-using System.Text;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Editor;
 using Microsoft.VisualStudio.Text.Outlining;
@@ -93,7 +93,8 @@ public class CodeFoldingTests : AbstractRazorEditorTest
 
         static string PrintLines(ImmutableArray<CollapsibleBlock> lines, ITextView textView)
         {
-            var sb = new StringBuilder();
+            using var _ = StringBuilderPool.GetPooledObject(out var sb);
+
             foreach (var line in lines)
             {
                 sb.AppendLine();
diff --git a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/InProcess/EditorInProcess_Hover.cs b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/InProcess/EditorInProcess_Hover.cs
index 07388e35f7..1ba1e6e58e 100644
--- a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/InProcess/EditorInProcess_Hover.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/InProcess/EditorInProcess_Hover.cs
@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.VisualStudio.Language.Intellisense;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Adornments;
@@ -68,7 +69,8 @@ internal partial class EditorInProcess
     {
         var hoverContent = await HoverAsync(position, cancellationToken);
 
-        var sb = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var sb);
+
         TraverseContent(hoverContent, sb);
         return sb.ToString();
 
diff --git a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/Semantic/RazorSemanticTokensTests.cs b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/Semantic/RazorSemanticTokensTests.cs
index 7a38a67ee0..5a360a06dc 100644
--- a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/Semantic/RazorSemanticTokensTests.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/Semantic/RazorSemanticTokensTests.cs
@@ -6,10 +6,10 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.VisualStudio.Razor.IntegrationTests.InProcess;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Classification;
@@ -143,7 +143,8 @@ public class RazorSemanticTokensTests : AbstractRazorEditorTest
 
     private static void GenerateSemanticBaseline(IEnumerable<ClassificationSpan> actual, string baselineFileName)
     {
-        var builder = new StringBuilder();
+        using var _ = StringBuilderPool.GetPooledObject(out var builder);
+
         foreach (var baseline in actual)
         {
             builder.Append(baseline.Span.Start.Position).Append(Separator);
diff --git a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/VisualStudioLogging.cs b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/VisualStudioLogging.cs
index d077753303..b22b5f8872 100644
--- a/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/VisualStudioLogging.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/VisualStudioLogging.cs
@@ -6,9 +6,9 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.Internal.VisualStudio.Shell.Embeddable.Feedback;
 using Microsoft.VisualStudio.ComponentModelHost;
 using Microsoft.VisualStudio.Shell;
@@ -98,7 +98,8 @@ internal static class VisualStudioLogging
     private static void RazorExtensionExplorerLogger(string filePath)
     {
         var hiveDirectory = GetHiveDirectory();
-        var fileBuilder = new StringBuilder();
+
+        using var _ = StringBuilderPool.GetPooledObject(out var fileBuilder);
 
         var extensionsDir = Path.Combine(hiveDirectory, "Extensions");
         var compatListFile = Path.Combine(extensionsDir, "CompatibilityList.xml");