I’ve also started experiencing this issue (100% CPU, fan going wild, tabs becoming unusable) after upgrading to the latest version a few days ago. I disabled Hardware Acceleration, but the issue is still occurring. Any other steps to take to try and solve the issue?
MacBook Pro (15-inch, 2018)
2.6 GHz 6-Core Intel Core i7
32 GB RAM
macOS Catalina 10.15.3
Brave Version 1.4.95 Chromium (64-bit)