Compatibility Report

• Name of the game with compatibility issues: Half Sword Playtest (https://store.steampowered.com/app/2397300/Half_Sword/)
• Steam AppID of the game: 2527870

System Information

• GPU: AMD Radeon RX 6700 XT
• Video driver version: Mesa 24.1.5
• Kernel version: 6.9.10
• Link to full system information report as Gist: Runtime Information
• Proton version: experimental-9.0-20240730
• Proton log: steam-2527870.log

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.

Symptoms

After the game loads past the initial Unreal Engine splash screen, all mouse/keyboard/display updates appear to happen at a rate of less than 1 per second. Moving the mouse in or off the game window updates the cursor less than once per second. This occurs after the Unreal Engine logo has disappeared. It's not just the game that updates slowly, but all graphics from the system does too.

Desktop returns to normal update rate after quitting the game. The Steam Overlay FPS counter also bottoms out at "1 FPS".

(wine:3427800): GStreamer-Video-CRITICAL **: 22:38:03.575: gst_video_info_from_caps: assertion 'gst_caps_is_fixed (caps)' failed stands out in the logs.

Reproduction

1. Open the game.
2. Install VC++ runtime as prompted (makes no difference whether this is done or not).
3. Wait until the Unreal Engine splash screen is gone.
4. Note input and video updating at a rate of less than once per second.