• Startup time to the first frame

  • Check the time whenWidgetsBinding.instance.firstFrameRasterized is true.
  • See theperf dashboard.

• Frame buildDuration, rasterDuration, and totalSpan

  • SeeFrameTiming in the API docs.

• Statistics of framebuildDuration (*_frame_build_time_millis)

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

• Statistics of framerasterDuration (*_frame_build_time_millis)

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

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

  • The usage is currently only available through trace events. Seeprofiling_summarizer.dart.
  • Seemetrics for thesimple_animation_perf_ios test.

• release_size_bytes to approximately measure the size of a Flutter app

  • See thebasic_material_app_android,basic_material_app_ios,hello_world_android,hello_world_ios,flutter_gallery_android, andflutter_gallery_ios tests.
  • Seemetrics in the dashboard.
  • For info on how to measure the size more accurately, see theapp size page.

For a complete list of performance metrics Flutter measures per commit, visit the following sites, clickQuery, and filter thetest andsub_result fields:

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