ScrollView+Image.Url performance test-case

Bug Reports
1

I put together this sample test-case for the team and anyone who’s interested. The scrollview displays a few (50 by default) image elements downloaded over Http.

There’s an animated loading indicator (spinner) which acts as the reload button as well. Simple.

Download from here: https://fusecommunity.slack.com/files/jveres/F0H4PQE7J/gallerytest.zip

My bug report:

  • on Android I get ~20fps
  • on iOS I only get ~15fps, sometimes even less
  • scrolling is jerky, especially during image download
  • if you scroll the layout during the spinning animation you can get occasional frame drops
  • ui becomes frozen sometimes for seconds on iOS

My questions:

  • how could this code be improved to get 60fps on device?:slight_smile:
  • what would be the best memory policy for image heavy apps?

thx

2

Woah, that’s not 60FPS at all, is it?

Thanks for the test case, we will investigate.

3

Just tested with the latest (5414) and things seems changed/optimized a bit. My observations:

  • after the scrollview populated, the first tap causes huge lag but then it gets very responsive
  • async image loading/drawing doesn’t seem to have lagging effect on the scrollview now
  • after a few reloads the app gets killed with “Terminated with memory issue” on iOS
  • playing with the app, I had an unwanted system restart on Android (no logs, unfortunatelly)
4

Thanks for the intel. We’ve had similar reports with reboot problems (wtf?) with the preview build. We’re on it!

5

Just wondering if there’s any progress made on this. Digging the internals I found that TextureLoader::ByteArrayToTexture2DContentType causes the UI lags when called from HttpImageSourceImpl::HttpCallback.

6

This should have been mitigated by doing TextureLoader::ByteArrayToTexture2DContentType on a background-thread, and this fix will most likely be included in the 0.9.8 release. From my testing this helps a great deal. Please let us know if it doens’t help you.

7

Thanks Erik for the update and your efforts. I will let you know for sure.