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It turns out `postMessage` is quite a bit more expensive than `queueMicrotask`. Before dynamic threading, this is what we actually did, and perf regressed when we started using `postMessage` instead. This fixes https://github.com/flutter/flutter/issues/166905
Flutter Engine
Setting up the Engine development environment
See here
gclient bootstrap
Flutter engine uses gclient to manage dependencies.
If you've already cloned the flutter repository: