My iPhone 12 Pro drops frames when scrolling the Flutter Web gallery [0]. Flutter Web also doesn’t support iOS’ ubiquitous tap status bar to scroll to top and has different scrolling acceleration, deceleration and springiness.

Flutter on iOS has had animation hitches since the switch from OpenGL to Metal. Animations drop frames on their first run, during shader compilation [1].

0. https://gallery.flutter.dev/#/ 1. https://github.com/flutter/flutter/issues/61450