My ten second search shows 20.04 is too old for Pipewire to work well, but it works on 20.10 and presumably 21.04. It supposedly fixes the CPU usage issue you h

My ten second search shows 20.04 is too old for Pipewire to work well, but it works on 20.10 and presumably 21.04. It supposedly fixes the CPU usage issue you have, so relief may be available.