The stutter fest from a late-game Phantom Lancer?

Sometimes my PC also starts annoyingly long shader caching as I’m trying to play a game. If you cancel the shader caching, does the game not launch?

Otherwise if you suspect the issue is with Proton,you could use an older version and see if that helps?

You definitely don’t have to worry about Dota because it runs natively on Linux. I have a 3060 and it functions about as well as it did on Windows. For specific games, check ProtonDB or ask here