Details

1. Please tell us exactly how to reproduce the problem you are running into, and how you measured the performance.

2. Build a Dart SDK which can detect unnecessary imports. Use https://dart-review.googlesource.com/c/sdk/+/177221.

3. Analyze Flutter sources.

4. Witness many files which contain import directives whose used elements are provided by another import directive.

5. Please attach a small application (ideally just one main.dart file) that
   reproduces the problem. You could use https://gist.github.com/ for this.

No thank you.

3. Switch flutter to master channel and run this app on a physical device
   using profile or release mode. Verify that the performance issue can be
   reproduced there.

n/a

Target Platform: any
Target OS version/browser: any
Devices: any

Logs

n/a