Major Stutters when going between areas and the game freezes upon logging in. Setting the graphics settings to higher settings causes the game to freeze long enough that it times out logging in, but setting the graphics settings to lower settings allowes you to log in after freezing on the loading screen for a while. Graphics settings can be maxed out once in game and seem to increase the rate at which stuttering occurs.

My system gives me a not responding prompt after logging in as the game loads. As noted in the performance problem section, setting the graphics settings to higher settings causes the game to freeze long enough that it times out logging in.

So long as you can get by the Login Screen freeze, it works just fine from a network standpoint. Gameguard is now loading on Linux under Proton (I can't believe this is real)