super slow built for WASM. non WASM works fine

[sgehrman]

Super slow on WASM. Not sure why. Your code is very inefficient. I tried to fork it and fix it but it's still super slow.

[Frogperson]

It seems wasm support was rolled back for some reason 8c44d9d
But I'm forcing it with this in my pubspec and I don't think I'm noticing any performance issues.

dependency_overrides:
  isolate_manager: ^6.1.2

Are you sure you added the COEP and COOP headers to enable multiple threads? https://docs.flutter.dev/platform-integration/web/wasm#serve-the-built-output-with-an-http-server
flutter run -d chrome --wasm --web-header=Cross-Origin-Opener-Policy=same-origin --web-header=Cross-Origin-Embedder-Policy=credentialless