Run systeminfo and post it here, that will help the developers.
Worth trying is repairing Rhino:
https://discourse.mcneel.com/t/repair-rhino-vs-uninstall-reinstall/210235/2
Check what GPU drivers you are on, some times newer are better, but Windows have changed how they handle performance for GPU’s a bit, taken over a bit of the control the drivers had before, so this can be the reason. Thus newest drivers might help.
I helped a user figuring out what caused issues, and went the “is it the dock, the cables, the drivers road” but repairing Rhino was what fixed it.
Good luck, and hopefully some more skilled comes along 