While looking into #4325, with `f32_test.dart` open and running "Reload Window" to restart, I see this in the console: <img width="605" alt="Screenshot 2022-12-28 at 11 31 13" src="https://user-images.githubusercontent.com/1078012/209805694-1df68c6b-e367-428f-b6cd-4821f39695e5.png"> Several profiles here: [cpu profiles.zip](https://github.com/Dart-Code/Dart-Code/files/10313974/cpu.profiles.zip)