Does run0 use suid? From my understanding, it shouldn’t.

What headset? Most headsets work fine now. I had some issues with an old WMR headset (HP Reverb G2), but even Windows doesn’t support WMR anymore so it’s basically dead. Went with a Quest 3 eventually and it works great with WiVRn (ALVR works as well, but it’s a bit more clunky).

“Free” memory is actually usually used for cache. So instead of waiting to get data from the disk, the system can just read it directly from RAM after the first access. The more RAM you have, the more free space you’ll have to use for cache. My machine often has over 20GB of RAM used as cache. You can see this with free -m. IIRC both Gnome and KDE’s system managers also show that now.