--- a/gfx/layers/ipc/CompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/CompositorBridgeParent.cpp
@@ -947,25 +947,16 @@ CompositorBridgeParent::CompositeToTarge
 {
   AUTO_PROFILER_TRACING("Paint", "Composite");
   AUTO_PROFILER_LABEL("CompositorBridgeParent::CompositeToTarget", GRAPHICS);
 
   MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread(),
              "Composite can only be called on the compositor thread");
   TimeStamp start = TimeStamp::Now();
 
-#ifdef COMPOSITOR_PERFORMANCE_WARNING
-  TimeDuration scheduleDelta = TimeStamp::Now() - mCompositorScheduler->GetExpectedComposeStartTime();
-  if (scheduleDelta > TimeDuration::FromMilliseconds(2) ||
-      scheduleDelta < TimeDuration::FromMilliseconds(-2)) {
-    printf_stderr("Compositor: Compose starting off schedule by %4.1f ms\n",
-                  scheduleDelta.ToMilliseconds());
-  }
-#endif
-
   if (!CanComposite()) {
     TimeStamp end = TimeStamp::Now();
     DidComposite(start, end);
     return;
   }
 
 #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
   if (!mWaitForPluginsUntil.IsNull() &&

--- a/gfx/layers/ipc/CompositorVsyncScheduler.h
+++ b/gfx/layers/ipc/CompositorVsyncScheduler.h
@@ -83,22 +83,16 @@ public:
    */
   void ForceComposeToTarget(gfx::DrawTarget* aTarget, const gfx::IntRect* aRect);
 
   /**
    * Return the vsync timestamp of the last or ongoing composite. Must be called
    * on the compositor thread.
    */
   const TimeStamp& GetLastComposeTime() const;
-#ifdef COMPOSITOR_PERFORMANCE_WARNING
-  const TimeStamp& GetExpectedComposeStartTime()
-  {
-    return mExpectedComposeStartTime;
-  }
-#endif
 
 private:
   virtual ~CompositorVsyncScheduler();
 
   // Schedule a task to run on the compositor thread.
   void ScheduleTask(already_AddRefed<CancelableRunnable>);
 
   // Post a task to run Composite() on the compositor thread, if there isn't
@@ -131,20 +125,16 @@ private:
     Mutex mMutex;
     // Hold raw pointer to avoid mutual reference.
     CompositorVsyncScheduler* mOwner;
   };
 
   CompositorVsyncSchedulerOwner* mVsyncSchedulerOwner;
   TimeStamp mLastCompose;
 
-#ifdef COMPOSITOR_PERFORMANCE_WARNING
-  TimeStamp mExpectedComposeStartTime;
-#endif
-
   bool mAsapScheduling;
   bool mIsObservingVsync;
   uint32_t mNeedsComposite;
   int32_t mVsyncNotificationsSkipped;
   widget::CompositorWidget* mWidget;
   RefPtr<CompositorVsyncScheduler::Observer> mVsyncObserver;
 
   mozilla::Monitor mCurrentCompositeTaskMonitor;