WPF window hangs?

Question

WPF

Why the program hangs, and in general the window does not move to the second screen, any change in the size of the window, and freezes, as if the image element is redrawn there a trillion times

foreach(var edge in edges) // 10 000+
            {
                c.DrawLine(pen, new Point(edge.Start.X,edge.Start.Y),new Point(edge.End.X,edge.End.Y));
            }
            c.Close();

            var i = new Image();
            
            d.Drawing.Freeze();/// ? вообще не врубаюсь что этот метод делает
// но pen.Freeze()  повышает скорость программы в 100000000000000000 раз как минимум
            i.Source = new DrawingImage(d.Drawing);
            i.Source.Freeze();
            Canvas.Children.Add(i);

So there is no hangup, if the image itself is displayed in a separate bitmap =new RenderTargetBitmap(); And then work with him, but I don’t know if it’s right