Performance metrics

• Startup time to the first frame

  • Check the time when WidgetsBinding.instance.firstFrameRasterized is true.
  • See the perf dashboard.

• Frame buildDuration, rasterDuration, and totalSpan

  • See FrameTiming in the API docs.

• Statistics of frame buildDuration (*_frame_build_time_millis)

  • We recommend monitoring four stats: average, 90th percentile, 99th percentile, and worst frame build time.
  • See, for example, metrics for the flutter_gallery__transition_perf test.

• Statistics of frame rasterDuration (*_frame_build_time_millis)

  • We recommend monitoring four stats: average, 90th percentile, 99th percentile, and worst frame build time.
  • See, for example, metrics for the flutter_gallery__transition_perf test.

• CPU/GPU usage (a good approximation for energy use)

  • The usage is currently only available through trace events. See profiling_summarizer.dart.
  • See metrics for the simple_animation_perf_ios test.

• release_size_bytes to approximately measure the size of a Flutter app

  • See the basic_material_app_android, basic_material_app_ios, hello_world_android, hello_world_ios, flutter_gallery_android, and flutter_gallery_ios tests.
  • See metrics in the dashboard.
  • For info on how to measure the size more accurately, see the app size page.

For a complete list of performance metrics Flutter measures per commit, visit the following sites, click Query, and filter the test and sub_result fields:

• https://flutter-flutter-perf.skia.org/e/
• https://flutter-engine-perf.skia.org/e/