Your system information

• Steam client version (build number or date): 1769025840

• Distribution (e.g. Ubuntu): Fedora 43 KDE

• Opted into Steam client beta?: [Yes/No] No

• Have you checked for system updates?: [Yes/No] Yes

• Steam Logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs] steam-logs.tar.gz

• GPU: AMD 9070

• CPU: AMD Ryzen 5700x3d

Please describe your issue in as much detail as possible:

Expect same performance as on Windows host, but getting about 1/3 of performance on Linux native CS2 client compared to Windows native client
Changing the graphics settings has little effect on the situation.
Issue can't be reproduced via Proton, FPS stays normal

Steps for reproducing this issue:

1. Run CS2
2. Entering server
3. Getting random FPS which decreases over time down to 40fps