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.
It should support DLSS unless you have an older video card, which the drivers don’t work well with. I heard the newer Nvidia cards work better though. Of course, is all up to you whether you like it or not, so just try out Linux and see. If you don’t like it just reinstall Windows. Make a recovery Windows USB beforehand though, makes it easier to reinstall.