Flutter frames chart (Flutter apps only)

Timeline events chart

CPU profiler

Use a profile build of your application to analyze performance.
  Frame rendering times aren’t indicative of release performance
  when running in debug mode. Run your app in profile mode,
  which still preserves useful debugging information.

The performance view also supports importing and exporting of
data snapshots. For more information,
check out the Import and export section.

What is a frame in Flutter?

Flutter is designed to render its UI at 60 frames per second
(fps), or 120 fps on devices capable of 120Hz updates.
Each render is called a frame.
This means that, approximately every 16ms, the UI updates
to reflect animations or other changes to the UI. A frame
that takes longer than 16ms to render causes jank 
(jerky motion) on the display device.

Flutter frames chart