Then why are you using NVIDIA? The AMD open-source driver stack is very mature by now

I had switched back to Windows after years of issues with Linux drivers, I needed a new PC, and I needed CUDA for college and tinkering.

Now, it's been barely a couple of months since I reinstalled Ubuntu, and a couple of weeks since I found out the latest release runs even worse, so this is new to me. I don't plan to use Windows at home ever again, so I could sell my GPU and buy AMD, but so far I'm simply disappointed.

Ugh, that sucks. It makes sense. I'm somewhat optimistic that as the open-sourcing effort continues, more and more of NVIDIA's driver stack will be open-source and it will see significant improvements, too.

If you're using DisplayPort, try switching to HDMI. (Really.) For me it made the freezes much shorter. It's a bug in their driver related to the connected monitor(s).

That didn't occur to me! I'll give it a try, although I suspect that will break VRR for my setup.