[Windows] Performance of gesture updating

[MartyIX]

Description

Speedscope for my application shows significant amount of time spent in UpdateDragAndDropGestureRecognizers:

I'm not exactly sure why. I'm filing this issue mostly to reference it a PR of mine.

Steps to Reproduce

Create a project containing:

<Label Text="Drag me">
    <Label.GestureRecognizers>
        <DragGestureRecognizer CanDrag="True" />
    </Label.GestureRecognizers>
</Label>

and many (say 200) of

<Rectangle Stroke="Red"
   Fill="DarkBlue"
   StrokeThickness="4"
   HeightRequest="200"
   WidthRequest="200">
    <Rectangle.GestureRecognizers>
        <DragGestureRecognizer DragStarting="DragGestureRecognizer_DragStarting" />
    </Rectangle.GestureRecognizers>
</Rectangle>

and start the application. UpdateDragAndDropGestureRecognizers should take non-trivial amount of time.

Link to public reproduction project repository

No response

Version with bug

8.0.10 SR3

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

No response

Did you find any workaround?

One workardound is to use less drag&drop recognizers. But obviously it's not always possible.

Relevant log output

No response

[MartyIX]

I believe this was improved in:

• [WinUI] Cache gesture event subscriptions #21959
• [Windows] Set CanDrag and AllowDrop only if needed #22640
• [Windows] Subscribe less pointer events in UpdatingGestureRecognizers #22781