Okay the issue has been magically fixed for me. I don't know exactly what happened, but after changing my computer from my bedroom to my living room it seems that the issue is fixed lol. It could be many things, I don't know exactly what fixed it.
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
Proton Log
Symptoms
When a mouse with a high polling rate is connected (in my case it is a Logitech G203 that is 1000Hz), moving the mouse makes the whole game drop from a locked 120FPS to 1 FPS, freezing the game completely until I stop moving the mouse again. I have tested with other games, such as Quake II RTX, Batman Arkham Knight, and neither of these games have the same issue, using the same exact setup.
Reproduction