Mouse pointer graphically poorly displayed when hovering over the window border

I installed Qubes 4.1 with the new sys-gui extension. The PC is equipped with Intel Graphics and 16 GB RAM, the mouse is connected via P2/S. I have noticed that the mouse cursor displays poorly when hovering over window borders.

Some seem to have a similar problem:

How to solve it? Maybe sys-gui needs more RAM? But how should I allocate more RAM if a sys-gui VM is not displayed in the Qubes manager?