In my experience, most games either don’t work at all (very rare), or work 99% as well as on Windows. For instance, I’m playing Hitman WoA right now, and opening the Steam overlay makes the game run in slow motion until I restart it, and it goes in the single-digit FPS if my laptop is charging. Very rarely does a game run better on Linux than Windows. Alt- tabbing in particular is broken in a lot of games, some of them outright crashing.