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Performance regression on WebAssembly #21130

@MartinZikmund

Description

@MartinZikmund

Update

This seems to be a regression on WASM, where some parts of the UI are now very laggy and risizing the window is blanking out the page completely. Here you can see comparison of prod gallery vs canary. You can see the slider is lagging significantly on Canary and resizing causes the page to become completely blank

Recording.2025-07-24.095609.mp4

Current behavior 🐛

When some Uno Skia WASM apps are resized, they are blanking out temporarily. Interestingly, it is not happening in all applications, e.g. it happens reliably in Samples app and Chefs, but not in Uno Gallery

Recording.2025-07-23.113503.mp4

Expected behavior 🎯

Should never happen

How to reproduce it (as minimally and precisely as possible) 🔬

No response

Workaround 🛠️

No response

Renderer 🎨

  • Skia
  • Native

Affected platforms 📱💻🖥️

WebAssembly

Uno.Sdk version (and other relevant versions) 📦

6.2.0-dev.28

IDE version 🧑‍💻

VS 2022

Anything else we need to know? 💬

No response

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difficulty/tbdCategorizes an issue for which the difficulty level needs to be defined.kind/regressionSomething was working, now it isn'ttriage/untriagedIndicates an issue requires triaging or verification

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