[android] avoid View.Context during CollectionView scrolling #8243
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Context: dotnet#8012 Context: https://github.com/Kalyxt/Test_CollectionView We had some reports of poor `CollectionView` performance while scrolling on an older Android device. Reviewing `dotnet trace` output, I did find some issues similar to dotnet#8001: 317.42ms (1.1%) mono.android!Android.Views.View.get_Context() 1% of the time is spent in repeated calls to `View.Context` inside the `ItemContentView` class. Making a new overload for `ContextExtensions.FromPixel()`, I was able to remove all of these calls. This results in only a couple `View.Context` calls on startup now, much better: 1.30ms (0.01%) mono.android!Android.Views.View.get_Context() Using the "janky frames" metric from the latest profiler in Android Studio Dolphin: https://developer.android.com/studio/profile/jank-detection With my slowest Android 12+ device, a Pixel 4a, I could actually see a few "janky frames" while scrolling the sample. With these changes in place, I only see 1 "janky frame" now. I also compared the before and after with the visual GPU profiler: https://developer.android.com/topic/performance/rendering/inspect-gpu-rendering It appears at a glance that these changes are better. I am unsure at what point the performance will be good enough to close dotnet#8012, but this helps!
jonathanpeppers
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hartez
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Jun 22, 2022
Eilon
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Context: #8012
Context: https://github.com/Kalyxt/Test_CollectionView
We had some reports of poor
CollectionViewperformance whilescrolling on an older Android device.
Reviewing
dotnet traceoutput, I did find some issues similar to #8001:1% of the time is spent in repeated calls to
View.Contextinside theItemContentViewclass. Making a new overload forContextExtensions.FromPixel(), I was able to remove all of thesecalls.
This results in only a couple
View.Contextcalls on startup now,much better:
Using the "janky frames" metric from the latest profiler in Android
Studio Dolphin:
https://developer.android.com/studio/profile/jank-detection
With my slowest Android 12+ device, a Pixel 4a, I could actually see a
few "janky frames" while scrolling the sample.
With these changes in place, I only see 1 "janky frame" now:
I also compared the before and after with the visual GPU profiler:
https://developer.android.com/topic/performance/rendering/inspect-gpu-rendering
Before:
After:
It appears at a glance that these changes are better.
I am unsure at what point the performance will be good enough to close
#8012, but this helps!