@Cheese-King-of-Denmark the game is working fine for me on amd and nvidia, including multiplayer (at least from joining a random room). But it should be noted that nvidia's driver branch 535 originally came out in 2023, it'd be better to try a newer branch as it is likely affecting things negatively
@simifor Just a few days ago it was working perfectly fine with that driver, so I think that seems unlikely. The only thing that's changed is the update from Proton 10.0-3 to 10.0-4.
That's not possible. Proton 10.0-4 was released in January https://github.com/ValveSoftware/Proton/releases/tag/proton-10.0-4.
@kisak-valve Well, Proton updated in between me playing and it working and then it not working. So far as I can tell, it changed from 10.0-3 to 10.0-4. Maybe I'm mistaken, but regardless it was working fine and then it wasn't, without either the game or my PC being updated, but Proton did update.
@Cheese-King-of-Denmark proton should have updated long ago, are you sure you didn't see another version update? And given that I can't repro on my end and that there aren't any other reports so far, I still think your best course of action is going with a more recent driver version and seeing if that makes a difference, and if it doesn't you need to supply the information you omitted from your original report, namely the gist with steam's "system information" output and a proton log.
proton 10.0-4x1 2026-06proton 10.0-3x1 2026-06
Compatibility Report
System Information
I confirm:
Symptoms
The game lags horribly from launch and multiplayer connectivity is almost completely broken. It worked perfectly well in version 10.0-3