Same issues here. Annoying as I wrote a big message then soon as I pressed upload image it deleted all my text in this post!
Version 1.7.60 Chromium: 80.0.3987.132 (Official Build) dev (64-bit)
MacOS Catalina: 10.15.3 (19D76)
MacBook Pro (15-inch, 2018) - 2.2 GHz 6-Core Intel Core i7 - 16 GB 2400 MHz DDR4 - Intel UHD Graphics 630 1536 MB
I’ve tried all the suggestions, one observation I’ve see is minimising the browser will bring it down slightly but then back to high CPU and temp.