The above linked article explains why Zoom is so fatiguing. The four reasons listed below are a lot of the problem. We need to address these and make changes as we can to keep Zoom from exhausting us. The article is really good. I have just taken the four reasons from it. Reading the article is a lot more helpful than my small blurb of it. There is a great survey at the end of the article. It explains your own Zoom fatigue and what it means. I, unfortunately, scored in the 96th percentile.
1) Excessive amounts of close-up eye contact is highly intense.
2) Seeing yourself during video chats constantly in real-time is fatiguing.
3) Video chats dramatically reduce our usual mobility.
4) The cognitive load is much higher in video chats.
bookworm at the gym 