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.
Exactly. The message should be: similar performance to Windows, give or take about 10% depending on the game.
So if you’re already interested in switching to Linux, SP gaming won’t be much of a concern.