Created attachment 171410 [details]
Screenshot of SteamVR performance graph after update with "Display Error" purple lines

SUMMARY
After I did a "pacman -Syu" System upgrade I tried playing SteamVR but it's suddenly extremely laggy / stuttery and therefore unplayable.
The lag can only be experienced in the VR headset (I'm using Valve Index)
The VR game view on the desktop looks fine without any stuttering.

The purple lines in the performance graph in the SteamVR box (see screenshot) mean "Display Error".
There was no lag and no purple lines before the update (see other screenshot)

I don't know if this is a KDE issue, but I have ruled out kernel and nvidia driver (by updating them separately beforehand and checking it still works) so far and I don't know what else could have caused this.
It was a pretty big list of updates (few hundreds of packages - I will send it as soon as I can)

I can rollback my system to the state before the update where it still works without issues.

The issue happens on X11 and Wayland 

STEPS TO REPRODUCE
1. Try using SteamVR with up-to-date KDE
2. Experience lag in VR headset (any game as well as SteamVR Home)

OBSERVED RESULT
Extreme lag in the VR headset

EXPECTED RESULT
Smooth gameplay like before the update

SOFTWARE/OS VERSIONS

Not working version:
Operating System: Arch Linux 
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.9.7-3-cachyos-lto (64-bit)
Graphics Platform: Wayland
Processors: 24 × 13th Gen Intel® Core™ i7-13700K
Memory: 62.5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3090 Ti/PCIe/SSE2