Quadro RTX 6000 on XEN Hypervisor, poor Brush Performance in Photoshop

Hi, we have Server with Xen Hypervisor 8.2 LTSR, Nivida Quadro RTX 6000 wit 450.55 Software. XEN Desktop is 1912. We publish VMs with Adobe Photoshop and RTX6000P-2Q vGPU. The Brush Performance is bad. It’s lagging and hangs. If I deactivate GPU Support all works fine.

Any suggastion?

Thanks Tobias