Howdy!
Been wrestling a bit with a huge performance impact whenever I use a usb audio device (Fosi Audio ZD3), either connected directly to a single qube or setup via a Audio VM. When the device is connected and playing audio the entire operating system and all qubes suffer from huge degradation, sometimes to the point where I have to forcibly restart the entire machine. Interestingly however during this time the audio continues playing, but I can’t interact with anything.
In XenTop nothing looked particularly off, CPU and RAM of all qubes seems fine, I have an I7255U and 64gb of ram. What I did eventually realize, is that if I connect via bluetooth instead of USB the performance issues go away entirely.
I’m not sure where to investigate from here to understand what is going on, appreciate any suggestions on what to check.