choppy viewport

[Dutchbird]

Even in small scenes my viewport is choppy when materials are on in viewport options.
When i try to rotate the viewport it becomes very choppy in quick shading.
What could possibly be wrong?
These are my Viewport Hardware settings.

[Dr. Sassi]

Hi Dutchbird,

Please check with tech-support:
https://www.maxon.net/en/support-center

My best wishes