Hello @CitrineSilly, we're using one issue report per unofficially supported game title, and usually I'd transfer this issue report to #4229, however, you've correctly identified that you have a video driver issue instead of a Proton issue.
You're running Steam in a Flatpak environment, and the installed NVIDIA driver inside that environment doesn't match the host system. The NVIDIA proprietary driver requires that the running kernel module, 32 bit userspace libraries, and 64 bit userspace libraries are all installed and exactly the same version to work properly. Since Flatpak is involved, that extends to both inside and outside that container environment. Tell Flatpak to do an update cycle, and if that doesn't help, then report the issue to the Flatpak package maintainers.
Closing as not a Proton issue.
proton hotfixx1 2025-07
Note: i forgot to label this and it seems i cant label it myself, Could someone mark this with the compatiblity issues: unofficial label please
Compatibility Report
System Information
I confirm:
Proton log:
Proton is not generating logs
Local Game log:
Player.log
Symptoms
Game runs at 2-15 seconds per frame
Graphical artifacts are present on certain bloom objects
As a result of the performance issues audio does not work either except for some crunchy snippets of audio
Image example w/o fps counter:

Reproduction