I had really bad performance with an nvidia GPU in VR in Linux, once, and all I could find that described the same specific issue I had was a steam community discussion post by someone who claimed that the steam vr compositor was just bugged, and no less that it was a bug regression, and there was nothing to do but wait for Valve to fix it. I think the post was already a year old when I found it.

I haven’t tried it again, yet, but I’ve also moved to arch with Wayland since then. And the nvidia drivers did become much more reliable for me, so maybe it will magically work out of the box this time… Or maybe it won’t, and I’ll just end up wasting hours trying to find a solution while wading through AI polluted Google searches again before giving up.