CS2 on Linux (Bazzite): Poor Performance on Official Proton, VAC Blocks Proton GE

[GNU/LINUX]

I am experiencing two blocking issues running CS2 on Linux using Bazzite:

Very poor performance on official Proton builds
VAC warnings when using Proton GE, despite file verification

System details
OS: Bazzite (stable)
Kernel: 6.17.x
Desktop: KDE Plasma 6.5.3
Session: Wayland
CPU: Ryzen 5 2600
GPU: AMD Radeon RX 9070 XT
RAM: 32 GB
Display: 1920×1080 @ 180 Hz

Behavior
Proton Experimental / Proton 9.x (official)
Game launches and VAC allows matchmaking
Performance is very poor: heavy stutter, inconsistent frametimes, feels unplayable
Proton GE (Performance improves significantly but VAC blocks matchmaking with a warning about modified files)
“Verify integrity of game files” does not resolve this

What I have tried
Verifying game files
Rebooting
Changing Proton versions (official only)
FPS caps

None of these resolve both performance and VAC compliance at the same time.

[Ace The Kangaroo]

Did you have issues with the native version of CS2?

[zmlties]

50% bottleneck with the CPU is wild

but in all seriousness, has cs2 worked on your PC with windows (just curious if it had ever worked before on another os)

[✘ʞupanᶜʰᵘ✘]

windows is best

[Metal]

Try arch or nobara, gaming distro.

I personaly used nobara and was a blast.

[GNU/LINUX]

Originally posted by Ace The Kangaroo:

Did you have issues with the native version of CS2?

Yes. When I did the first install thats where the issue were. I decided to try a different compatiblity option.GE was GREAT but VAC doesnt work.

[Lonex[GER]]

install latest Bios Update for Ryzen 2700X. After Update, set your RAM to EXPO.