Are you using DirectX 11 or Vulkan (there's a selector on the launcher page). Perhaps try the other option to see if that's better.

I had a problem during early access when running the game in DX11 on Windows 11 where framerates dropped hugely. I eventually tracked the problem down to the HDR setting which was on by default. As I had no need for HDR, I disabled it which fixed the problem.

If you have this setting on and are finding the game runs okay in Vulkan but not DX11, that's one possible culprit.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"