Alright, finally I found some time to work on this issue. I tried many things, like reinstalling drivers, updating everything with no avail. In the end I played around in the device manager and it turned out that when I uninstall the device, scan for new hardware (which installs it again) the issue is gone. However this only lasts until the next reboot where the issue is back again. Since I could reproduce the approach above quite well I decided to create a script which does that automatically on startup.         I hope this helps some people to circumnavigate the issue until there's a proper fix. See also my topic  on the Windows help forum for additional details
Whenever Windows 11 plays a notification sound, it's delayed by a couple hundred milliseconds up to 1 second. This is very annoying and makes the whole system feel buggy and slow. My drivers are all up to date. What else can I do?
XPS 15 9520 - Windows notification sounds are delayed