1) Restart your Chromebook AND your home router.
2) Plug in your charger to your Chromebook while on Zoom.
3) Check to see that your Chrome OS is up to date.
4) Turn of Gallery View in Chrome.
5) If you are using a monitor at home, Zoom recommends to avoid connecting multiple monitors to minimize CPU load constraints.
6) Close other tabs or Apps while on your Zoom meeting.
7) Turn OFF Bluetooth if it is not needed (high CPU usage seen from the Bluetooth backend service).