[wasm] Performance issue + crash

[tguerin]

main.dart.mjs:19 JavaScriptError
main.dart.mjs:19 at RenderObject._paintWithContext (http://localhost:62519/main.dart.wasm:wasm-function[19977]:0x26efd8)
main.dart.mjs:19 at PaintingContext.paintChild (http://localhost:62519/main.dart.wasm:wasm-function[20029]:0x2722f6)
main.dart.mjs:19 at _RenderLayoutBuilder.paint (http://localhost:62519/main.dart.wasm:wasm-function[19991]:0x270838)
main.dart.mjs:19 at RenderObject._paintWithContext (http://localhost:62519/main.dart.wasm:wasm-function[19977]:0x26efa7)
main.dart.mjs:19 at PaintingContext.paintChild (http://localhost:62519/main.dart.wasm:wasm-function[20029]:0x2722f6)
main.dart.mjs:19 at _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (http://localhost:62519/main.dart.wasm:wasm-function[19993]:0x270943)
main.dart.mjs:19 at RenderObject._paintWithContext (http://localhost:62519/main.dart.wasm:wasm-function[19977]:0x26efa7)
main.dart.mjs:19 at PaintingContext._repaintCompositedChild (http://localhost:62519/main.dart.wasm:wasm-function[19973]:0x26ee97)
skwasm.wasm:0xa78d Uncaught RuntimeError: table index is out of bounds
at skwasm.wasm:0xa78d
at skwasm.wasm:0x239011
at pictureRecorderEndRecording (main.dart.wasm:0x26c13c)
at SkwasmPictureRecorder.endRecording (main.dart.wasm:0x26c10b)
at PaintingContext.stopRecordingIfNeeded (main.dart.wasm:0x26f042)
at PaintingContext._repaintCompositedChild (main.dart.wasm:0x26ee9f)
at PaintingContext.repaintCompositedChild (main.dart.wasm:0x26e47f)
at PipelineOwner.flushPaint (main.dart.wasm:0x25ec21)
at PipelineOwner.flushPaint (main.dart.wasm:0x25ec66)
at