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ListView performance issues on WebAssembly #20956

@w-ahmad

Description

@w-ahmad

What would you like to be added? 💡

When running the same app on Desktop and WebAssembly with a ListView, it becomes clear that the ListView doesn't scroll efficiently. I've included an example app and a video comparison for both platforms. The app is in release mode, running without a debugger attached. This performance issue is causing slowness of my WinUI.TableView control on WebAssembly, despite no code differences between WebAssembly and other platforms.

see w-ahmad/WinUI.TableView#171

test app UnoApp1.zip

Screen.Recording.2025-07-06.170022.mp4

Why is this needed? 🤔

No response

Renderer 🎨

  • Skia
  • Native

For which platforms 📱💻🖥️

WebAssembly

Anything else we need to know? 💬

No response

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area/listview 📃Categorizes an issue or PR as relevant to the ListView controlarea/performance 📈Categorizes an issue or PR as relevant to performancekind/enhancementNew feature or requestplatform/wasm 🌐Categorizes an issue or PR as relevant to the WebAssembly platformproject/items 🧾Categorizes an issue or PR as relevant to items (ItemsControl, ItemsRepeater, ...)renderer/skia

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