WPF: Shape layer performance issue

[EmaDozer]

Mapsui Version
4.1.7

Mapsui Platform
WPF

Device
Windows

Describe the bug
Relative small shapes cause the map to be laggy. I use RasterizingTileLayer with SqlitePersistentCache and without projection between map and shape.

I attached a sample project:
ShapeLayer.zip

Method to create shape layer:

private static ILayer CreateShapeLayer()
 {
     var shapeFile = new Mapsui.Nts.Providers.Shapefile.ShapeFile(
        Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "shapes", "EZG_KB_LM.shp"), false)
     { CRS = "EPSG:3857" };

     var sqlitePersistentCache = new SqlitePersistentCache("shapes");
     sqlitePersistentCache.Clear();

     var layer = new Layer
     {
         Name = "Test",
         DataSource = shapeFile,
         Style = CreateVectorThemeStyle(),
     };

     return new RasterizingTileLayer(layer, persistentCache: sqlitePersistentCache);
 }

To Reproduce
Open the sample project and zoom to the shape.

[pauldendulk]

If there is no persistentCache there is no such lag?

[EmaDozer]

I tried it also without the persistentCache, made not really a difference.

[EmaDozer]

I added another sample where you can enable 2 different layers (size 1MB and 3.6MB). Currently its hard to use Mapsui with shapes on WPF or maybe i am missing something fundamental?

zip:
Uploading shape perfromance issue.zip…

video:
https://github.com/user-attachments/assets/0122be6d-140d-4f18-9389-9c686ac62e6f

[jamaa]

The lagginess occurs even with very small shapes of 5KB, either we are doing something fundamentally wrong or this version of MapsUI is just not able to deal with shapefiles well? If someone with more experience with MapsUI could have a look at the sample project above, maybe they could point us in the right direction?