https://github.com/flutter/flutter/wiki/Engine-disk-footprint#treemaps points to guidance on how to generate treemaps of the Flutter Engine. This used to work at some point. See https://storage.googleapis.com/flutter_infra_release/flutter/12def739b1f63ccaf5b859714d9f552e9e6fe348/android-arm64-release/sizes/index.html. However, it no longer works for recent engine commits. See https://storage.googleapis.com/flutter_infra_release/flutter/4d1f8ff52903dc94574397228597488ec8c089d7/android-arm64-release/sizes/index.html (the SHA is the latest engine.version in framework as of this writing).