Yea that seemed off to me as well, looking at the minimum spcs, a 970 is enough to play this game:
https://www.systemrequirementslab.com/cyri/requirements/the-finals/22956
You should be able to play this without issue. Maybe look at what version of proton you are using and see if changing it helps. Only thing I can think of off the top of my head that might be the issue.
Most multiplayer games that use anticheat are the only kind of games Linux can’t handle these days it would seem. Proton changed the game man.
Combine that with the rise of indie titles, its a good time to be a Linux gamer. Timberborn and Ostranauts have been a blast.
Well mostly Timberborn, Ostranauts kept kicking my ass.