Flutter for Web is significantly slower in master than versions of 1.10.16 and before. #49132
Description
The same code compiled for the web is much slower on the current master than in version 1.10.16 and below. Sample:
Version 1.10.16: http://beta.mugalon.com/
Master: http://beta.mugalon.com/fluttermaster/
Anything that involves any kind of nontrivial animation will get super slower (< 10 FPS on mid-end mobile devices) and somewhat slow on mid-end desktop machines (20-30FPS) on the current master.
With version 1.10.16 things are fine, beeing above 30 FPS even on mid to low-end mobile devices and close to 60FPS on desktop.
Flutter 1.14.2-pre.51 • channel master • https://github.com/flutter/flutter.git
Framework • revision ec1044a877 (34 hours ago) • 2020-01-17 19:19:33 -0800
Engine • revision ecc74c966d
Tools • Dart 2.8.0 (build 2.8.0-dev.3.0 f96c48307d)