Compatibility Report

• Name of the game with compatibility issues: Shadow Gambit: The Cursed Crew
• Steam AppID of the game: 1545560

System Information

• GPU: Sapphire RX 7800 XT nitro+
• Video driver version: Mesa 25.0.4
• Kernel version: 6.14.6-300.fc42.x86_64
• Link to full system information report as Gist:
• Proton version: 9.0-4

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

Please add PROTON_LOG=1 %command% to the game's launch options and
attach the generated $HOME/steam-$APPID.log to this issue report as a file.
(Proton logs compress well if needed.)
I will do that tomorrow.

Symptoms

After ~30 minutes(1.5 missions) the game begins having performance issues.
FPS drops from a locked 165 with 0 drops.
To 120 and every movement of the camera or mouse drops FPS to 80-65 fps area, the bigger problem is that the frame-time is super inconsistent and it looks like it reaches something fairly nasty despite a high enough FPS.
I haven't noticed for the GPU Core clock nor VRAM frequency to drop significantly while playing.
I play maxed out at 1080p 165hz vsync on, 100% render scale.
Around 40(1800mhz)-60%(2200mhz) core util.

Reproduction

1. I play the a single level of the game and get to another mission. (I go through around 4 locations, ship->mission->ship->mission).
2. In total around 30-45 minutes passes.
3. The game begins having nasty performance issues and has to be restarted.