Macbook Air M1 external webcam

I got a MacBook Air M1 (8 Core GPU, 1 TB, 16GB RAM), and since I got it, I've been having trouble with external cameras (especially in Zoom, but experiencing it all through the machine).

I've tried my Blackmagic Design ATEM mini, Logitech C920 HD, and several apps to use my phone as a web cam.

All of them exhibit dropped frames, freezing, and general slowdowns for the rest of the MacBook Air.

I've also experienced slow downs while streaming video from Wisita (haven't seen any issues with Youtube or Vimeo, but haven't really tried anything there this week).

Any advice or suggestions on this?