I also switched to Linux last month. It hasn't been a smooth experience with my GPU as I'm encountering memory leaks in popular compositors. I also get 150-200ms keyboard input delay in all games using some compositors but not all. I documented as much as I could here https://nickjanetakis.com/blog/gpu-memory-allocation-bugs-wi....
Still, despite all of that when it works it is better than Windows. It's just ironic that my Linux desktop is less stable than Windows 10 since I have to reboot 2-3 times a day from GPU memory leaks. Windows 10 was really stable with the same hardware and had no input delay in games. I only rebooted when the OS pushed an update since I keep my machine on 24 / 7.
It would be fair to mention that this is happening for you with a decade old GPU using an EOL driver, which sucks, but is unlikely to be a common experience.
For that old of a GPU you may have a better time on X instead of wayland - there the NVIDIA drivers are supposed to be pretty decent.