When running my framework dependent, unpackaged, .NET 8, WinUI 3 app (with all the latest dependencies) on my client’s computer (Windows 11) some UI functionality is very slow.
Examples:
-
When right-clicking on an item in order to open
ContextFlyoutmenu it takes sometimes 2 seconds before it shows. Continuing right-clicking might reveal the menu quicker. Then it’s slower again. -
Another example is the
CalendarDatePicker: also like 2 seconds before the calendar view is displayed. -
Opening
ContentDialogis also slow, 2 – 3 seconds.
On my computer it quite snappy and runs fine once it loads.
The older WinForms version of the app (which uses the same lower layer dependencies, just the UI layer is WinForms instead of WinUI 3) does not have this problem on my client’s computer.
It’s hard to image what software would interact with mouse clicks. But other apps do not have this problem so I don’t think there’s another app interfering. I have allowed the app in Windows Defender.
Any tips I could try out would be highly appreciated.