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Hello everyone,

I'm encountering significant performance degradation when integrating our custom WinUI 3 controls into a complex application. Specifically, rendering and update operations seem to be much slower than expected, even after optimization efforts like virtualization and efficient data binding. Has anyone else experienced similar issues or have insights into common pitfalls when developing high-performance custom UI elements in WinUI 3? I'm using C# and XAML, targeting Windows 10, version 1903.

Any guidance or shared experiences would be greatly appreciated!

Hi DevGuy42,

I've seen this before. Often, the culprit is excessive use of layout invalidations or inefficient `Measure` and `Arrange` overrides in custom `Control` or `Panel` derivatives. Make sure you're only invalidating necessary parts of the UI and that your `MeasureOverride` and `ArrangeOverride` methods are as performant as possible. Consider using the `Xaml Diagnostics` tool in Visual Studio to profile your UI element's layout pass.

Another common area is the `OnApplyTemplate` method. Avoid heavy computation or resource loading there.

@UXMaster Good points. Also, check if you're using `VisualStateManager` extensively and how you're triggering state changes. Complex state transitions can sometimes be taxing.

Are your custom controls inheriting directly from `UserControl` or `Control`? Sometimes a leaner base class can help if you don't need all the features.