I stumbled on this site last week and anecdotally I can confirm that disabling Keystone helps. I was driven to find answers after no longer being able to hear people on Zoom calls because of the fan noise from my 16" MBP. I got sick of having to wear noise cancelling headphones when Chrome and Zoom turn my laptop into a space heater.
The Keystone thing though, it's not a panacea. It seems to fix the issue with WindowServer running away with the CPU, but Chrome is still pretty terrible. I decided to just deal with the switching cost and stopped using Chrome altogether. It has made all the difference. Switched to Firefox and I'm not looking back.