Enhance tracing

To view more detailed tracing in the timeline events chart,
use the options in the enhance tracing dropdown:

Note:
  Frame times might be negatively affected when these options are enabled.

To see the new timeline events, reproduce the activity
in your app that you are interested in tracing,
and then select a frame to inspect the timeline.

Track widget builds

To see the build() method events in the timeline,
enable the Track Widget Builds option.
The name of the widget is shown in the timeline event.

Track layouts

To see render object layout events in the timeline,
enable the Track Layouts option:

Track paints

To see render object paint events in the timeline,
enable the Track Paints option:

More debugging options

To diagnose performance problems related to rendering layers,
toggle off a rendering layer.
These options are enabled by default.