It causes a bunch of weird controller errors, such as when a controller disconnects (or if the deck goes to sleep), it can’t reconnect again.
Just let it use the default version (which I believe should be Proton Hotfix, or whatever Valve decides it should be since BG3 is an AAA headliner, they’ll want this to work)
To be fair, it’s not the type of game that requires high framerates to play.
I mean, it’s not a visual novel. It has action, cutscenes. I’d say 30fps is bare minimum for me.