Unplayable stuttering halfway into second mission of the session

Issue Description (Required):

For a baseline, I average probably 50-55 FPS most of the time. Around halfway into the second mission after I launch the game (cannot confirm if it is dependent on time or actual mission progress), the game will start stuttering and drop the average FPS to around 10-20. It is what I would consider unplayable, and does not go away until I reboot the game, though it vanishes temporarily when i am downed. It only stutters when I am moving in the world or moving my mouse, regardless of what happens onscreen otherwise. The stuttering does not seem to be affected by graphics settings.

This does not seem to be affected by the presence of mods.
I am on linux, and I am aware of the inherent performance losses that will bring, but this is much worse than I would expect.
I have attached the logs, as well as two videos. The one that is in a sandy tan area is a baseline, before the stuttering. The other is during the stuttering.

Attempted Solutions (Optional):

I have changed video settings all the way from the very lowest (resolution to the minimum, 50% resolution scaling on top, everything else low or off), to the very highest (excluding raytracing, I leave that off), including in the configuration file. I have added -DX11 to the launch options (added it like 3 or 4 months ago and it made the game tolerable since then), as well as increasing the lua heap size to 2048mb (does not seem to help). I have tried various proton versions, though none seemed to alleviate the issue.

Platform (Required):

PC - Steam

[PC] PC Specifications (Optional):

Computer Information:
Manufacturer: ASUSTeK COMPUTER INC.
Model: PRIME B450M-A II
Form Factor: Desktop
No Touch Input Detected
Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD Ryzen 7 5700G with Radeon Graphics
CPU Family: 0x19
CPU Model: 0x50
CPU Stepping: 0x0
CPU Type: 0x0
Speed: 4673 MHz
16 logical processors
8 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: Unsupported
AVX512PF: Unsupported
AVX512ER: Unsupported
AVX512CD: Unsupported
AVX512VNNI: Unsupported
SHA: Supported
CMPXCHG16B: Supported
LAHF/SAHF: Supported
PrefetchW: Unsupported
BMI1: Supported
BMI2: Supported
F16C: Supported
FMA: Supported
Operating System Version:
“EndeavourOS Linux” (64 bit)
Kernel Name: Linux
Kernel Version: 6.12.4-arch1-1
X Server Vendor: The X.Org Foundation
X Server Release: 12401004
X Window Manager: KWin
Steam Runtime Version:
Client Information:
Version: 1733944536
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 6700 XT (radeonsi, navi22, LLVM 18.1.8, DRM 3.59, 6.12.4-arch1-1)
Driver Version: 4.6 (Compatibility Profile) Mesa 24.3.1-arch1.3
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x1002
DeviceID: 0x73df
Revision Not Detected
Number of Monitors: 2
Number of Logical Video Cards: 1
Primary Display Resolution: 1920 x 1080
Desktop Resolution: 3840 x 1080
Primary Display Size: 18.90" x 10.63" (21.65" diag), 48.0cm x 27.0cm (55.0cm diag)
Primary VRAM: 12288 MB
Sound card:
Audio device: USB Mixer
Memory:
RAM: 64094 Mb
VR Hardware:
VR Headset: None detected
Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Total Hard Disk Space Available: 1920742 MB
Largest Free Hard Disk Block: 234881 MB
Storage:
Number of SSDs: 2
SSD sizes: 2048G,1024G
Number of HDDs: 0
Number of removable drives: 0

Upload Supporting Evidence (Optional):


[PC] Upload Console Log & darktide_launcher.log (Optional):

console-2024-12-13-01.54.31-600e8354-fd58-4683-97a4-49328fe3fb18.log (419 KB)
darktide_launcher.log (7.06 KB)

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