SKCanvas PaintSurface with Rotation very slow with UWP

[TomQv]

I'm following up #758
The issue is closed, but I dont know, if it was fixed or if there is a workaround.

Anyway, I have it and it makes the UWP-App unusable.

The following code takes 500ms with Rotation != 0, and 50ms with no Rotation on UWP.
With Android 100ms with and 70ms without, with iOS no difference, 70ms with or without rotation.

So whats wrong with rotation with UWP?

     async void MapView_PaintSurface(object sender, SKPaintSurfaceEventArgs e)
     {
            var t1 = new QvX.Helper.MeasureElapsedTime();
            CurrentView.Width = e.Info.Width;
            CurrentView.Height = e.Info.Height;

           foreach (var l in _layer)
                await l.ViewHasChanged(CurrentView, _layer[0], CancellationToken.None );

            var canvas = e.Surface.Canvas;
            canvas.Clear(SKColors.GreenYellow);

            using (new SKAutoCanvasRestore(canvas))
            {
                canvas.RotateDegrees((float)CurrentView.Rotation, (float)CurrentView.Width / 2, (float)CurrentView.Height / 2);

                var orderedlayer = _layer.Where(l => l.IsVisible).OrderBy(l => l.DrawOrder).ToList();
                foreach (var l in _layer)
                {
                    if (l.Surface != null)
                        canvas.DrawSurface(l.Surface, SKPoint.Empty);
                }
            }
            
            _statusBar .Text= CurrentView .ToString () + " " + t1.ElapsedTimeToString;
        }

My system:

Microsoft Visual Studio Community 2019
Version 16.11.3
VisualStudio.16.Release/16.11.3+31702.278
Microsoft .NET Framework
Version 4.8.04084

Installed Version: Community

Visual C++ 2019 00435-60000-00000-AA686
Microsoft Visual C++ 2019

.NET Core Debugging with WSL 1.0
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ASP.NET and Web Tools 2019 16.11.75.64347
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ASP.NET Web Frameworks and Tools 2019 16.11.75.64347
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0 16.11.75.64347
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Azure Functions and Web Jobs Tools 16.11.75.64347
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C# Tools 3.11.0-4.21403.6+ae1fff344d46976624e68ae17164e0607ab68b10
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Common Azure Tools 1.10
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Microsoft Visual Studio VC Package 1.0
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Mono Debugging for Visual Studio 16.10.15 (552afdf)
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NuGet Package Manager 5.11.0
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ProjectServicesPackage Extension 1.0
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TypeScript Tools 16.0.30526.2002
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Visual Basic Tools 3.11.0-4.21403.6+ae1fff344d46976624e68ae17164e0607ab68b10
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Visual F# Tools 16.11.0-beta.21322.6+488cc578cafcd261d90d748d8aaa7b8b091232dc
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Mono: c633fe9
Java.Interop: xamarin/java.interop/d16-11@48766c0
ProGuard: Guardsquare/proguard@912d149
SQLite: xamarin/sqlite@85460d3
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-11@683f375

Xamarin.iOS and Xamarin.Mac SDK 14.20.0.25 (3b53e529b)
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