XPS 13 9315, Windows Audio Device Graph Isolation High CPU

During Zoom calls, Windows Audio Device Graph Isolation uses 30% of CPU, causing Zoom calls to stutter and making it impossible to do anything else during call.  This is an XPS 13 9315 with 12th Gen Intel(R) Core(TM) i7-1250U   1.10 GHz and 32 gb RAM.  I have 1 gb internet speed.

I've tried everything for the past year:
- Disabled audio enhancements (why should I have to do that with a supposedly powerful computer?

- Updated drivers and bios, and also rolled them back

- Reset the computer multiple times

- Even bought new speakers

That last one was a waste of money because I later realized the problem happens both when I use the internal speakers as well as external speakers when connected to a docking station.

I’m pretty upset about this problem.  It has made this computer useless for one of the most important things for which I need it, which is video conferencing.

This is my fourth Dell XPS 13.  My older Dell XPS 13 that I still have works fine on Zoom but has other issues. 

Loved the other XPS 13s.  Not at all happy with this one.  Probably the last Dell I’ll buy.