Nice level does not help on many systems because of autogroups
PipeWire sets nice -11 to avoid abrupted/crackling sound under high system load etc.
But this does not help for many systems because of autogroups enabled.
You can read detailed explanation e.g. here: https://www.reddit.com/r/linux/comments/d7hx2c/
Basically we just want to set autogroup nice along with the regular nice. This is fairly simple:
$ echo -11 > /proc/self/autogroup
Edited by Hanabishi