Added another Visual Sample

src/Visual/CreateRenderer/README.txt

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+Thanks to Chris King for his amazing Profiler and to Shane Neuville for his help.

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance.Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+using VisualPerformance.Droid.Services;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+
+namespace VisualPerformance.Droid
+{
+    [Activity(
+        Label = "VisualPerformance", 
+        Icon = "@mipmap/icon", 
+        Theme = "@style/MainTheme", 
+        MainLauncher = true, 
+        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    public class MainActivity : Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            Profile.Start();
+            TabLayoutResource = Resource.Layout.Tabbar;
+            ToolbarResource = Resource.Layout.Toolbar;
+
+            base.OnCreate(savedInstanceState);
+            Forms.Init(this, savedInstanceState);
+            FormsMaterial.Init(this, savedInstanceState);
+            DependencyService.Register<ProfilerService>();
+            LoadApplication(new App());
+        }
+    }
+}

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance.Android/VisualPerformance.Android.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{0EA8A4FF-69BD-4CD0-A793-04DFE6A9486B}</ProjectGuid>
+    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{c9e5eea5-ca05-42a1-839b-61506e0a37df}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>VisualPerformance.Droid</RootNamespace>
+    <AssemblyName>VisualPerformance.Android</AssemblyName>
+    <AndroidApplication>True</AndroidApplication>
+    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
+    <AndroidResgenClass>Resource</AndroidResgenClass>
+    <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
+    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
+    <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
+    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
+    <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AotAssemblies>true</AotAssemblies>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidManagedSymbols>true</AndroidManagedSymbols>
+    <AndroidUseSharedRuntime>false</AndroidUseSharedRuntime>
+    <AotAssemblies>true</AotAssemblies>
+    <EnableLLVM>false</EnableLLVM>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Mono.Android" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.1.0.471358-pre1" />
+    <PackageReference Include="Xamarin.Forms.Visual.Material">
+      <Version>4.1.0.471358-pre1</Version>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Helpers\ProfilerTimeHelper.cs" />
+    <Compile Include="MainActivity.cs" />
+    <Compile Include="Resources\Resource.designer.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Services\ProfilerService.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\AboutResources.txt" />
+    <None Include="Assets\AboutAssets.txt" />
+    <None Include="Properties\AndroidManifest.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\layout\Tabbar.axml" />
+    <AndroidResource Include="Resources\layout\Toolbar.axml" />
+    <AndroidResource Include="Resources\values\styles.xml" />
+    <AndroidResource Include="Resources\values\colors.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon_round.xml" />
+    <AndroidResource Include="Resources\mipmap-hdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-hdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-mdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-mdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\launcher_foreground.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\drawable-hdpi\" />
+    <Folder Include="Resources\drawable-xhdpi\" />
+    <Folder Include="Resources\drawable-xxhdpi\" />
+    <Folder Include="Resources\drawable-xxxhdpi\" />
+    <Folder Include="Resources\drawable\" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\VisualPerformance\VisualPerformance.csproj">
+      <Project>{5AA03230-5C60-4743-9D77-A97146F56090}</Project>
+      <Name>VisualPerformance</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance.iOS/VisualPerformance.iOS.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">iPhoneSimulator</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{85F1A158-375C-4F07-9C3A-C8FEC9DE0384}</ProjectGuid>
+    <ProjectTypeGuids>{FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{6143fdea-f3c2-4a09-aafa-6e230626515e}</TemplateGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>VisualPerformance.iOS</RootNamespace>
+    <IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
+    <AssemblyName>VisualPerformance.iOS</AssemblyName>
+    <MtouchHttpClientHandler>NSUrlSessionHandler</MtouchHttpClientHandler>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <MtouchArch>x86_64</MtouchArch>
+    <MtouchLink>None</MtouchLink>
+    <MtouchDebug>true</MtouchDebug>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhoneSimulator' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchLink>None</MtouchLink>
+    <MtouchArch>x86_64</MtouchArch>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhone' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhone\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <MtouchArch>ARM64</MtouchArch>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchDebug>true</MtouchDebug>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhone\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchArch>ARM64</MtouchArch>
+    <ConsolePause>false</ConsolePause>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Ad-Hoc|iPhone' ">
+    <DebugType>none</DebugType>
+    <Optimize>True</Optimize>
+    <OutputPath>bin\iPhone\Ad-Hoc</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>False</ConsolePause>
+    <MtouchArch>ARM64</MtouchArch>
+    <BuildIpa>True</BuildIpa>
+    <CodesignProvision>Automatic:AdHoc</CodesignProvision>
+    <CodesignKey>iPhone Distribution</CodesignKey>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'AppStore|iPhone' ">
+    <DebugType>none</DebugType>
+    <Optimize>True</Optimize>
+    <OutputPath>bin\iPhone\AppStore</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>False</ConsolePause>
+    <MtouchArch>ARM64</MtouchArch>
+    <CodesignProvision>Automatic:AppStore</CodesignProvision>
+    <CodesignKey>iPhone Distribution</CodesignKey>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="AppDelegate.cs" />
+    <Compile Include="Services\ProfilerService.cs" />
+    <None Include="Entitlements.plist" />
+    <None Include="Info.plist" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <InterfaceDefinition Include="Resources\LaunchScreen.storyboard" />
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Contents.json">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon1024.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon180.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon167.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon152.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon120.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon87.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon80.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon76.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon60.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon58.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon40.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon29.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon20.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core" />
+    <Reference Include="Xamarin.iOS" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.1.0.471358-pre1" />
+    <PackageReference Include="Xamarin.Forms.Visual.Material">
+      <Version>4.1.0.471358-pre1</Version>
+    </PackageReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
+  <ItemGroup>
+    <ProjectReference Include="..\VisualPerformance\VisualPerformance.csproj">
+      <Project>{DA0FF6E6-32B5-4C7A-926A-95B68A8E9393}</Project>
+      <Name>VisualPerformance</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup />
+</Project>

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance/Profile.cs

@@ -0,0 +1,135 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+using Xamarin.Forms.Xaml;
+
+public class Datum
+{
+    public string Name;
+    public string Id;
+    public long Ticks;
+    public long SubTicks;
+    public int Depth;
+    public string Path;
+    public int Line;
+}
+
+public static class ContentPageEx
+{
+    const long MS = TimeSpan.TicksPerMillisecond;
+    public static List<Datum> Data = new List<Datum>();
+
+    private static void ASSERT(bool condition)
+    {
+        if (!condition) throw new Exception("assert");
+    }
+
+    private static long GatherTicks(ref int i)
+    {
+        var current = Data[i++];
+        var depth = current.Depth;
+        var total = current.Ticks;
+
+        while (i < Data.Count)
+        {
+            var next = Data[i];
+            if (next.Depth < depth)
+                break;
+
+            if (next.Depth > depth)
+            {
+                current.SubTicks = GatherTicks(ref i);
+                ASSERT(current.Ticks >= current.SubTicks);
+                continue;
+            }
+
+            i++;
+            current = next;
+            total += current.Ticks;
+        }
+
+        return total;
+    }
+
+    private static void AppendProfile(StringBuilder sb, long profiledMs, bool showZeros)
+    {
+        foreach (var datum in Data)
+        {
+            var depth = datum.Depth;
+
+            var name = datum.Name;
+            if (datum.Id != null)
+                name += $" ({datum.Id})";
+
+            var ticksMs = datum.Ticks / MS;
+            var exclusiveTicksMs = (datum.Ticks - datum.SubTicks) / MS;
+
+            var percentage = (int)Math.Round(ticksMs / (double)profiledMs * 100);
+            if (!showZeros && percentage == 0)
+                continue;
+
+            var line = $"{name} = {ticksMs}ms";
+            if (exclusiveTicksMs != ticksMs)
+                line += $" ({exclusiveTicksMs}ms)";
+            line += $", {percentage}%";
+
+            sb.AppendLine("".PadLeft(depth * 2) + line);
+        }
+    }
+
+    public static ContentPage LoadProfile(this ContentPage page)
+    {
+        Profile.Stop();
+        foreach (var datum in Profile.Data)
+        {
+            Data.Add(new Datum()
+            {
+                Name = datum.Name,
+                Id = datum.Id,
+                Depth = datum.Depth,
+                Ticks = datum.Ticks < 0 ? 0L : (long)datum.Ticks
+            });
+        }
+        var i = 0;
+        var profiledMs = GatherTicks(ref i) / MS;
+
+        var scrollView = new ScrollView();
+        var label = new Label();
+
+        var controls = new Grid();
+        var buttonA = new Button() { Text = "0s", HeightRequest = 62 };
+        controls.Children.AddHorizontal(new[] { buttonA });
+
+        var grid = new Grid
+        {
+            RowDefinitions = new RowDefinitionCollection {
+                new RowDefinition { Height = new GridLength(1, GridUnitType.Star) },
+                new RowDefinition { Height = GridLength.Auto },
+            },
+            ColumnDefinitions = new ColumnDefinitionCollection {
+                new ColumnDefinition { Width = GridLength.Star },
+            }
+        };
+        page.Content = grid;
+        grid.Children.Add(scrollView, 0, 0);
+        grid.Children.Add(controls, 0, 1);
+
+        scrollView.Content = label;
+
+        var showZeros = false;
+
+        Action update = delegate ()
+        {
+            var sb = new StringBuilder();
+            sb.AppendLine($"Profiled: {profiledMs}ms");
+            AppendProfile(sb, profiledMs, showZeros);
+            label.Text = sb.ToString();
+        };
+        buttonA.Clicked += delegate { showZeros = !showZeros; update(); };
+
+        update();
+        return page;
+    }
+}

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance/Views/MainView.xaml

@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<base:ProfilerPage
+    xmlns:base="clr-namespace:VisualPerformance.Views.Base"
+    xmlns="http://xamarin.com/schemas/2014/forms"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="VisualPerformance.Views.MainView">
+    <ContentPage.Resources>
+        <ResourceDictionary>
+
+            <Style x:Key="PerfFrameStyle" TargetType="Frame">
+                <Setter Property="VerticalOptions" Value="Center" />
+                <Setter Property="HasShadow" Value="True" />
+                <Setter Property="CornerRadius" Value="6" />
+                <Setter Property="Margin" Value="12" />
+            </Style>
+
+            <Style x:Key="PerfPanelStyle" TargetType="StackLayout">
+                <Setter Property="Spacing" Value="10" />
+                <Setter Property="BackgroundColor" Value="White" />
+                <Setter Property="Margin" Value="12" />
+            </Style>
+
+            <Style x:Key="SignInTitleStyle" TargetType="Label">
+                <Setter Property="FontSize" Value="24" />
+                <Setter Property="TextColor" Value="Black" />
+                <Setter Property="Margin" Value="0, 12, 0, 0" />
+            </Style>
+
+            <Style TargetType="Entry">
+                <Setter Property="PlaceholderColor" Value="OrangeRed" />
+                <Setter Property="BackgroundColor" Value="LightGray" />
+            </Style>
+
+            <Style x:Key="PerfButtontyle" TargetType="Button">
+                <Setter Property="FontSize" Value="18" />
+                <Setter Property="TextColor" Value="White" />
+                <Setter Property="BackgroundColor" Value="OrangeRed" />
+                <Setter Property="Margin" Value="0, 0, 0, 12" />
+            </Style>
+
+            <Style x:Key="PerfLabelStyle" TargetType="Label">
+                <Setter Property="HorizontalOptions" Value="End" />
+                <Setter Property="VerticalOptions" Value="End" />
+                <Setter Property="Margin" Value="6" />
+            </Style>
+
+        </ResourceDictionary>
+    </ContentPage.Resources>
+    <ContentPage.Content>
+        <Grid
+            BackgroundColor="DarkGray">
+            <Frame 
+                Visual="Material"
+                Style="{StaticResource PerfFrameStyle}">
+                <StackLayout 
+                    Style="{StaticResource PerfPanelStyle}">
+                    <Label 
+                        Visual="Material"
+                        Text="Label1"/>
+                    <Label 
+                        Visual="Material"
+                        Text="Label2"/>
+                    <ProgressBar 
+                        Visual="Material"
+                        ProgressColor="Orange"
+                        Progress="0.5"/>
+                    <ProgressBar
+                        Visual="Material"
+                        ProgressColor="Orange"
+                        Progress="0.2"/>
+                    <Slider
+                        Visual="Material" />
+                    <Slider
+                       />
+                    <Entry
+                        Visual="Material" />
+                    <Entry
+                        Visual="Material" />
+                    <Button  
+                        Visual="Material"
+                        AutomationId="materialButton"
+                        Text="Sign in" 
+                        Style="{StaticResource PerfButtontyle}"/>
+                    <Button  
+                        Visual="Material"
+                        AutomationId="defaultButton"
+                        Text="Click me to see performance" 
+                        Clicked="Handle_Clicked"
+                        Style="{StaticResource PerfButtontyle}"/>
+                </StackLayout>
+            </Frame>
+            <Label
+                Text="{Binding Timing}"
+                Style="{StaticResource PerfLabelStyle}"/>
+        </Grid>
+    </ContentPage.Content>
+</base:ProfilerPage>

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance/Views/MainView.xaml.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Diagnostics;
+using VisualPerformance.Services;
+using VisualPerformance.ViewModels;
+using VisualPerformance.Views.Base;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+
+namespace VisualPerformance.Views
+{
+    public partial class MainView : ProfilerPage
+    {
+        void Handle_Clicked(object sender, System.EventArgs e)
+        {
+            long count = 0;
+            foreach (var datum in Profile.Data)
+            {
+                count += datum.Ticks;
+                long ms = datum.Ticks / TimeSpan.TicksPerMillisecond;
+                Debug.WriteLine($"{datum.Name}-{datum.Id}: {ms} ms {count}");
+            }
+
+            Navigation.PushModalAsync(new ContentPage().LoadProfile());
+        }
+
+        public MainView ()
+		{
+			InitializeComponent ();
+            BindingContext = new MainViewModel(DependencyService.Get<IProfilerService>());
+        }
+
+        protected override async void OnAppearing()
+        {
+            base.OnAppearing();
+            await (BindingContext as MainViewModel).LoadDataAsync();
+        }
+    }
+}

src/Visual/CreateRenderer/VisualPerformance/VisualPerformance/VisualPerformance.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <DebugType>pdbonly</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.1.0.471358-pre1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Update="Views\MainView.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
+</Project>

src/Visual/Visual/VisualPerformance.sln

@@ -0,0 +1,143 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.645
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VisualPerformance.Android", "VisualPerformance\VisualPerformance.Android\VisualPerformance.Android.csproj", "{0EA8A4FF-69BD-4CD0-A793-04DFE6A9486B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VisualPerformance.iOS", "VisualPerformance\VisualPerformance.iOS\VisualPerformance.iOS.csproj", "{85F1A158-375C-4F07-9C3A-C8FEC9DE0384}"
+EndProject
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+EndProject
+Global
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+		AppStore|iPhone = AppStore|iPhone
+		AppStore|iPhoneSimulator = AppStore|iPhoneSimulator
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+		Debug|iPhone = Debug|iPhone
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
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+		Release|iPhone = Release|iPhone
+		Release|iPhoneSimulator = Release|iPhoneSimulator
+	EndGlobalSection
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+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FD376A8F-4236-453E-AA32-669E5F261379}
+	EndGlobalSection
+EndGlobal

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Assets/AboutAssets.txt

@@ -0,0 +1,19 @@
+Any raw assets you want to be deployed with your application can be placed in
+this directory (and child directories) and given a Build Action of "AndroidAsset".
+
+These files will be deployed with you package and will be accessible using Android's
+AssetManager, like this:
+
+public class ReadAsset : Activity
+{
+    protected override void OnCreate (Bundle bundle)
+    {
+        base.OnCreate (bundle);
+
+        InputStream input = Assets.Open ("my_asset.txt");
+    }
+}
+
+Additionally, some Android functions will automatically load asset files:
+
+Typeface tf = Typeface.CreateFromAsset (Context.Assets, "fonts/samplefont.ttf");

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Helpers/ProfilerTimeHelper.cs

@@ -0,0 +1,67 @@
+using Java.IO;
+using Java.Lang;
+using System;
+using System.Globalization;
+
+namespace VisualPerformance.Droid.Helpers
+{
+    // Based on: https://github.com/toomasz/XamarinAppStartupTime
+    // By Tomasz Ścisłowicz
+    public class ProfilerTimeHelper
+    {
+        const string LogcatTimeFormat = "yyyy-MM-dd HH:mm:ss.fff";
+
+        private static DateTime? StartupTime;
+        private static bool _attemptedToGetStartupTime;
+
+        public static DateTime? GetAppStartupTime()
+        {
+            if (_attemptedToGetStartupTime)
+            {
+                return StartupTime;
+            }
+            if (!StartupTime.HasValue)
+            {
+                StartupTime = GetStartupTimeFromLogcat();
+                _attemptedToGetStartupTime = true;
+            }
+            return StartupTime;
+        }
+
+        private static DateTime? GetStartupTimeFromLogcat()
+        {
+            var pid = Android.OS.Process.MyPid();
+
+            var process = new ProcessBuilder().
+                RedirectErrorStream(true).
+                Command("/system/bin/logcat", $"--pid={pid}", "-m", "1", "-v", "year").Start();
+
+            using (var bufferedReader = new BufferedReader(new InputStreamReader(process.InputStream)))
+            {
+                string line = null;
+                while ((line = bufferedReader.ReadLine()) != null)
+                {
+                    if (ParseLogDateTime(line, out DateTime date))
+                    {
+                        return date;
+                    }
+                }
+            }
+
+            return null;
+        }
+
+        private static bool ParseLogDateTime(string logLine, out DateTime dateTime)
+        {
+            if (logLine.Length < LogcatTimeFormat.Length)
+            {
+                dateTime = new DateTime();
+                return false;
+            }
+            var timeStr = logLine.Substring(0, LogcatTimeFormat.Length);
+
+            return DateTime.TryParseExact(timeStr, LogcatTimeFormat,
+                CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out dateTime);
+        }
+    }
+}

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Properties/AndroidManifest.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.VisualPerformance">
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
+	<application android:label="VisualPerformance.Android"></application>
+</manifest>

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Properties/AssemblyInfo.cs

@@ -0,0 +1,34 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Android.App;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("VisualPerformance.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("VisualPerformance.Android")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: ComVisible(false)]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+// Add some common permissions, these can be removed if not needed
+[assembly: UsesPermission(Android.Manifest.Permission.Internet)]
+[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage)]

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/AboutResources.txt

@@ -0,0 +1,50 @@
+Images, layout descriptions, binary blobs and string dictionaries can be included 
+in your application as resource files.  Various Android APIs are designed to 
+operate on the resource IDs instead of dealing with images, strings or binary blobs 
+directly.
+
+For example, a sample Android app that contains a user interface layout (main.xml),
+an internationalization string table (strings.xml) and some icons (drawable-XXX/icon.png) 
+would keep its resources in the "Resources" directory of the application:
+
+Resources/
+    drawable-hdpi/
+        icon.png
+
+    drawable-ldpi/
+        icon.png
+
+    drawable-mdpi/
+        icon.png
+
+    layout/
+        main.xml
+
+    values/
+        strings.xml
+
+In order to get the build system to recognize Android resources, set the build action to
+"AndroidResource".  The native Android APIs do not operate directly with filenames, but 
+instead operate on resource IDs.  When you compile an Android application that uses resources, 
+the build system will package the resources for distribution and generate a class called
+"Resource" that contains the tokens for each one of the resources included. For example, 
+for the above Resources layout, this is what the Resource class would expose:
+
+public class Resource {
+    public class drawable {
+        public const int icon = 0x123;
+    }
+
+    public class layout {
+        public const int main = 0x456;
+    }
+
+    public class strings {
+        public const int first_string = 0xabc;
+        public const int second_string = 0xbcd;
+    }
+}
+
+You would then use R.drawable.icon to reference the drawable/icon.png file, or Resource.layout.main 
+to reference the layout/main.xml file, or Resource.strings.first_string to reference the first 
+string in the dictionary file values/strings.xml.

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/layout/Tabbar.axml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.TabLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/sliding_tabs"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    app:tabIndicatorColor="@android:color/white"
+    app:tabGravity="fill"
+    app:tabMode="fixed" />

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/layout/Toolbar.axml

@@ -0,0 +1,9 @@
+<android.support.v7.widget.Toolbar
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/toolbar"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    android:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/mipmap-anydpi-v26/icon.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/mipmap-anydpi-v26/icon_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/values/colors.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="launcher_background">#FFFFFF</color>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Resources/values/styles.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+
+  <style name="MainTheme" parent="MainTheme.Base">
+  </style>
+  <!-- Base theme applied no matter what API -->
+  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
+    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
+    <item name="windowNoTitle">true</item>
+    <!--We will be using the toolbar so no need to show ActionBar-->
+    <item name="windowActionBar">false</item>
+    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
+    <!-- colorPrimary is used for the default action bar background -->
+    <item name="colorPrimary">#2196F3</item>
+    <!-- colorPrimaryDark is used for the status bar -->
+    <item name="colorPrimaryDark">#1976D2</item>
+    <!-- colorAccent is used as the default value for colorControlActivated
+         which is used to tint widgets -->
+    <item name="colorAccent">#FF4081</item>
+    <!-- You can also set colorControlNormal, colorControlActivated
+         colorControlHighlight and colorSwitchThumbNormal. -->
+    <item name="windowActionModeOverlay">true</item>
+
+    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
+  </style>
+
+  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
+    <item name="colorAccent">#FF4081</item>
+  </style>
+</resources>

src/Visual/Visual/VisualPerformance/VisualPerformance.Android/Services/ProfilerService.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using VisualPerformance.Droid.Helpers;
+using VisualPerformance.Services;
+
+namespace VisualPerformance.Droid.Services
+{
+    public class ProfilerService : IProfilerService
+    {
+        private static Dictionary<string, DateTime?> _eventTimingsSinceStartup = new Dictionary<string, DateTime?>();
+
+        public static void RegisterInternalEvent(string eventName)
+        {
+            if (_eventTimingsSinceStartup.ContainsKey(eventName))
+            {
+                return;
+            }
+
+            _eventTimingsSinceStartup.Add(eventName, DateTime.Now);
+        }
+
+        public void RegisterEvent(string eventName)
+        {
+            RegisterInternalEvent(eventName);
+        }
+
+        public async Task<Dictionary<string, TimeSpan?>> GetTimingsSinceStartup()
+        {
+            return await Task.Factory.StartNew(() =>
+            {
+                var timings = new Dictionary<string, TimeSpan?>();
+                var startupTime = ProfilerTimeHelper.GetAppStartupTime();
+
+                foreach (var eventInfo in _eventTimingsSinceStartup)
+                {
+                    timings.Add(eventInfo.Key, eventInfo.Value - startupTime);
+                }
+                return timings;
+            });
+        }
+
+        public DateTime? GetStartupTime()
+        {
+            return ProfilerTimeHelper.GetAppStartupTime();
+        }
+    }
+}

src/Visual/Visual/VisualPerformance/VisualPerformance.iOS/AppDelegate.cs

@@ -0,0 +1,29 @@
+using Foundation;
+using UIKit;
+using Xamarin.Forms;
+
+namespace VisualPerformance.iOS
+{
+    // The UIApplicationDelegate for the application. This class is responsible for launching the 
+    // User Interface of the application, as well as listening (and optionally responding) to 
+    // application events from iOS.
+    [Register("AppDelegate")]
+    public partial class AppDelegate : Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
+    {
+        //
+        // This method is invoked when the application has loaded and is ready to run. In this 
+        // method you should instantiate the window, load the UI into it and then make the window
+        // visible.
+        //
+        // You have 17 seconds to return from this method, or iOS will terminate your application.
+        //
+        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
+        {
+            Forms.Init();
+            FormsMaterial.Init();
+            LoadApplication(new App());
+
+            return base.FinishedLaunching(app, options);
+        }
+    }
+}

src/Visual/Visual/VisualPerformance/VisualPerformance.iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,117 @@
+{
+  "images": [
+    {
+      "scale": "2x",
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "3x",
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon60.png"
+    },
+    {
+      "scale": "2x",
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon58.png"
+    },
+    {
+      "scale": "3x",
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon87.png"
+    },
+    {
+      "scale": "2x",
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon80.png"
+    },
+    {
+      "scale": "3x",
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon120.png"
+    },
+    {
+      "scale": "2x",
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon120.png"
+    },
+    {
+      "scale": "3x",
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon180.png"
+    },
+    {
+      "scale": "1x",
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon20.png"
+    },
+    {
+      "scale": "2x",
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "1x",
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon29.png"
+    },
+    {
+      "scale": "2x",
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon58.png"
+    },
+    {
+      "scale": "1x",
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "2x",
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon80.png"
+    },
+    {
+      "scale": "1x",
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon76.png"
+    },
+    {
+      "scale": "2x",
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon152.png"
+    },
+    {
+      "scale": "2x",
+      "size": "83.5x83.5",
+      "idiom": "ipad",
+      "filename": "Icon167.png"
+    },
+    {
+      "scale": "1x",
+      "size": "1024x1024",
+      "idiom": "ios-marketing",
+      "filename": "Icon1024.png"
+    }
+  ],
+  "properties": {},
+  "info": {
+    "version": 1,
+    "author": "xcode"
+  }
+}