Jank (slow frame)

The frame rendering chart shows jank with a red overlay.
A frame is considered to be janky if it takes more than
~16 ms to complete (for 60 FPS devices). To achieve a frame rendering rate of
60 FPS (frames per second), each frame must render in
~16 ms or less. When this target is missed, you may
experience UI jank or dropped frames.

For more information on how to analyze your app’s performance,
check out Flutter performance profiling.

Shader compilation

Shader compilation occurs when a shader is first used in your Flutter
app. Frames that perform shader compilation are marked in dark
red:

For more information on how to reduce shader compilation jank,
check out Reduce shader compilation jank on mobile.

Timeline events chart