Scroll wheel behavior differs significantly in new architecture (Windows App SDK) vs WinUI 3 Gallery app

[chrisglein]

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Discussed in https://github.com/microsoft/react-native-windows/discussions/14642

^{Originally posted by Ferry-200 May 6, 2025} version:

{
  "dependencies": {
    "react": "19.0.0",
    "react-native": "0.78.0",
    "react-native-windows": "^0.78.0"
  }
}

I'm testing the React Native for Windows app using the new architecture (Windows App SDK). I noticed that the scroll wheel behavior is significantly different.

In the new architecture (Windows App SDK), scrolling with a mouse wheel feels much less responsive. The number of lines scrolled per wheel notch is considerably smaller compared to both the React Native Windows Gallery app and the official WinUI 3 Gallery app. As a result, scrolling through content feels sluggish and requires much more effort from the user.

This issue makes basic interaction in list views and scrollable content frustrating.

Any helps? Thanks!

https://github.com/user-attachments/assets/42702919-35e0-48ab-9ccc-7c98f8060b8e

[chrisglein]

Goal in the implementation was to match the numbers from WinUI, but clearly the behavior is different. Good catch. We'll look into it.

To investigate: Are there per-user mouse settings in effect here (as there are for mouse move speed)?