After upgrading to Catalina, I noticed that my MacBook Pro (13" with touchbar) would go from 100% battery to nearly zero in just about 30 minutes. The fans would be running like crazy. Using Activity Monitor, I tracked the culprit down to Apple Notes:
What the heck is going on here? Any idea how I can resolve this? I should also mention that this is reproducible every time… just open up notes and the fans will start going berserk.
UPDATE 1: I just installed the October 15 Supplemental update for Catalina, and there's no difference.
UPDATE 2: Booted into safe mode (hold shift at start up) and this was still the case. Energy Impact of Notes.app spiked to 300+ right away.
UPDATE 3: I reset SMC and PRAM/NVRAM. No difference.