[Big Screen Mode] Low performance

[perroboc]

Your system information

• Steam client version (build number or date): 1729208001
• Distribution (e.g. Ubuntu): Fedora 40 (RPMFusion)
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: AMD Radeon RX 7900 XTX

Please describe your issue in as much detail as possible:

Using Fedora 40, the performance of Big Screen Mode is low, even with GPU accelerated rendering.

Steps for reproducing this issue:

1. Using Fedora 40, install Steam from RPM Fusion
2. Enable Big Screen Mode

Demo video:

https://github.com/user-attachments/assets/93512089-34bb-4f07-a0db-1d6034c1131a

[kisak-valve]

Hello @perroboc, this issue is already being tracked at #11255. Closing as a duplicate.