We develop one flutter app we need focus to 06 metric performance below:
1. Startup time to the first frame: Check the time when WidgetsBinding.instance.firstFrameRasterized is true.
2. Frame buildDuration, rasterDuration, and totalSpan
3. Statistics of frame buildDuration (*_frame_build_time_millis): monitoring four stats: average, 90th percentile, 99th percentile, and worst frame build time.
4. Statistics of frame rasterDuration (*_frame_build_time_millis): monitoring four stats: average, 90th percentile, 99th percentile, and worst frame build time.
5. CPU/GPU usage
6. Release_size_bytes to approximately measure the size of a Flutter app
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