Performance Issues under Linux

I know this game is still not optimized, (and not officially supported under proton) but I wanted to raise this issue if you guys are not yet aware.

I see a lot of people being able to play this game fine both on Linux and Windows, but for some reason my FPS is atrocious.

Highest Graphics settings

Lowest Graphics settings:

System Information

Steam has detected the following hardware and software in your system:

Computer Information:

Manufacturer: Micro-Star International Co., Ltd.

Model: MAG B650 TOMAHAWK WIFI (MS-7D75)

Form Factor: Desktop

No Touch Input Detected

Processor Information:

CPU Vendor: AuthenticAMD

CPU Brand: AMD Ryzen 9 9950X3D 16-Core Processor

CPU Family: 0x1a

CPU Model: 0x44

CPU Stepping: 0x0

CPU Type: 0x0

Speed: 5756 MHz

32 logical processors

16 physical processors

Hyper-threading: Supported

FCMOV: Supported

SSE2: Supported

SSE3: Supported

SSSE3: Supported

SSE4a: Supported

SSE41: Supported

SSE42: Supported

AES: Supported

AVX: Supported

AVX2: Supported

AVX512F: Supported

AVX512PF: Unsupported

AVX512ER: Unsupported

AVX512CD: Supported

AVX512VNNI: Supported

SHA: Supported

CMPXCHG16B: Supported

LAHF/SAHF: Supported

BMI1: Supported

BMI2: Supported

F16C: Supported

FMA: Supported

Operating System:

NixOS 26.11 (Zokor) (64 bit)

Kernel Name: Linux

Kernel Version: 7.2

glibc Version: 2.42

X Server Vendor: The X.Org Foundation

X Server Release: 12401013

X Window Manager: xwayland-satellite

Steam Runtime Version: steam-runtime_1.0.20260714.251828

Client Information:

Version: 1789086785

Browser GPU Acceleration Status: Enabled

Browser Canvas: Enabled

Browser Canvas out-of-process rasterization: Enabled

Browser Direct Rendering Display Compositor: Disabled

Browser Compositing: Enabled

Browser Multiple Raster Threads: Enabled

Browser OpenGL: Enabled

Browser Rasterization: Enabled

Browser Raw Draw: Disabled

Browser Skia Graphite: Disabled

Browser Video Decode: Enabled

Browser Video Encode: Disabled

Browser Vulkan: Disabled

Browser WebGL: Enabled

Browser WebGL2: Enabled

Browser WebGPU: Disabled

Browser WebNN: Disabled

Video Card:

Driver: AMD AMD Radeon RX 9070 XT (radeonsi, gfx1201, ACO, DRM 3.64, 7.2.4)

Driver Version: 4.6 (Compatibility Profile) Mesa 26.2.2

OpenGL Version: 4.6

Desktop Color Depth: 24 bits per pixel

Monitor Refresh Rate: 143 Hz

VendorID: 0x1002

DeviceID: 0x7550

Revision Not Detected

Number of Monitors: 2

Number of Logical Video Cards: 1

Primary Display Resolution: 1920 x 1080

Desktop Resolution: 4520 x 1920

Primary Display Size: 20.87" x 11.81" (23.98" diag), 53.0cm x 30.0cm (60.9cm diag)

Primary VRAM: 16384 MB

Sound card:

Audio device: ATI R6xx HDMI

Memory:

RAM: 128401 Mb

Miscellaneous:

Total Hard Disk Space Available: 2114735 MB

Largest Free Hard Disk Block: 1792110 MB

At some point in the past when the game just "released" I was able to run this at 80ish fps at the highest settings.

If you need more information from me like logs or traces please contact me