diff --git a/gfx/layers/composite/APZCTreeManager.cpp b/gfx/layers/composite/APZCTreeManager.cpp
index 54041f145b0a..a432eebf8400 100644
--- a/gfx/layers/composite/APZCTreeManager.cpp
+++ b/gfx/layers/composite/APZCTreeManager.cpp
@@ -28,7 +28,7 @@
 namespace mozilla {
 namespace layers {
 
-float APZCTreeManager::sDPI = 72.0;
+float APZCTreeManager::sDPI = 160.0;
 
 APZCTreeManager::APZCTreeManager()
     : mTreeLock("APZCTreeLock"),
diff --git a/gfx/layers/ipc/AsyncPanZoomController.cpp b/gfx/layers/ipc/AsyncPanZoomController.cpp
index 79cd68a26a4a..0504812f9362 100644
--- a/gfx/layers/ipc/AsyncPanZoomController.cpp
+++ b/gfx/layers/ipc/AsyncPanZoomController.cpp
@@ -140,7 +140,7 @@ static bool gTouchActionPropertyEnabled = false;
  * accidentally processing taps as touch moves, and from very short/accidental
  * touches moving the screen.
  */
-static float gTouchStartTolerance = 1.0f/2.0f;
+static float gTouchStartTolerance = 1.0f/4.5f;
 
 /**
  * Default touch behavior (is used when not touch behavior is set).