So, im having an app, where i have to create lots of windows and this windows i use to render in them, so i have to create another window that acts like an overlay. Here is what im doing to set them position

private void ChangeCameras(bool newThread = false)
{
    if (newThread)
    {
        foreach (CameraWindow camera in Window!.OwnedWindows)
        {
            var dc = camera.DataContext as CellViewModel;

            Task.Run(() =>
            {
                dc!.cameraWindow!.Dispatcher.Invoke(() =>
                {
                    var cell = Cells![$"{dc!.X}:{dc.Y}"];

                    cell.UpdateLayout();
                    Point screenPoint = cell.PointToScreen(new Point(0, 0));

                    camera.Width = cell.ActualWidth - 40;
                    camera.Height = cell.ActualHeight - 40;

                    camera.Top = screenPoint.Y + 20;
                    camera.Left = screenPoint.X + 20;
                });
            });
        }
    }
    else
    {
        foreach (CameraWindow camera in Window!.OwnedWindows)
        {
            var dc = camera.DataContext as CellViewModel;
            var cell = Cells![$"{dc!.X}:{dc.Y}"];

            cell.UpdateLayout();
            Point screenPoint = cell.PointToScreen(new Point(0, 0));

            camera.Width = cell.ActualWidth - 40;
            camera.Height = cell.ActualHeight - 40;

            camera.Top = screenPoint.Y + 20;
            camera.Left = screenPoint.X + 20;
        }
    }
}

im setting them the position of usercontrol element, which named cell

as long as im not creating lots of windows im okay with result, but when there is like 15-20 windows it becomes pretty laggy, so maybe there is some way to optimize it?

how you can see, i`ve already tried to change position of each window in different thread, but it still pretty bad