Your system information

• Steam client version (build number or date): 1709168962
• Distribution (e.g. Ubuntu): Ubuntu 23.10 (64 bit)
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: Nvidia

Please describe your issue in as much detail as possible:

When I start a proton game, it takes about two minutes to reach a point where I see the game's ui. It even takes a long time for the proton log to appear, that why i'm opening the issue in this repo.

When i start steam from the console and launch a game i see

fsync: up and running.
wine: RLIMIT_NICE is <= 20, unable to use setpriority safely

In the logs. When using PROTON_LOG=1 the stream-{{ID}}.log file first appears forty seconds after that.

The "cloud status" display changes quickly, and then it's again about fourty seconds until i see some UI element of the game (anticheat/loading screen, etc). Sometimes a "Processing Vulkan Shaders" window appears but that's not the issue.

This is not specific to one game, some affected ones are: 603960, 553850, 1817190, 244160.

Changing the proton version has no effect on the startup time. Tried changing between experimental and the current 8.x version.

Checked the partition for possible errors in the SSD. Nothing was reported.

Steps for reproducing this issue:

1. Open Steam
2. Click "PLAY" on any of those games