I have AtlasOS. I only use Windows for two games, Rust and Destiny 2, that absolutely do not play on Linux. You will absolutely get better performance because the number of background tasks running all the time is quite minimal - it's clean and there's no store, no crappy apps you don't want. I don't care about security on the machine because I literally only game on it and maybe a little bit of web research if I get stuck on a game somehow. Anyway, I think it's good, it's really how Windows should be - if Windows didn't get so bad perhaps I wouldn't have gone to Linux.

You could try dual-booting for a bit to see how you like it.