

I think there’s huge variability, but as a gross overgeneralization AMD gpus run Cyberpunk 2077 a bit faster on Linux than Windows, and nVidia gpus run it a bit slower on Linux than on Windows.
If you’ve got a spare usb hard drive you could always install Linux there for a test drive though. You might be able to find a setup that gets you the extra performance you’re looking for.
See, that makes it sound to me like you could probably come up with a setup that would do what you want, but that doing so would probably mean making it worse at some of the other things you currently use it for.
Which is where using an external drive for a third installation might be easier. Or at least easier to dispose of if you get sick of the project. But I am perhaps unusually lazy in that regard.