Recent testing revealed that Arch Linux, Pop!_OS, and even Nobara Linux, which is maintained by a single developer, all outstripped Windows for the performance crown on Windows-native games. The testing was run at the high-end of quality settings, and Valve's Proton was used to run Windows games on Linux.
Let me know when you get Witcher 2 to run on Linux. With some tinkering and magic settings, it can run. But it crashes so often it is bordering unplayable, using several different versions of Proton in Steam and Pop! Os.
I don’t own it but according to protondb it has native support for Linux
That’s fine. But it crashes constantly on Linux, rarely on Windows. Point being that not all games run fine on Linux.