A Microsoft file hosting and synchronization service.
Finder, distnoted and OneDrive blow up my high-end MacBook Pro. I've had to resort to quitting OneDrive when I'm on battery, when I have my laptop on my lap, when I don't the fans blaring at full speed.
On top of the Finder extensions issue OneDrive is constantly "Processing changes" as seen by the snapshot below... "Processing xxx changes". This happens all the time.
I will try and open up another case with Microsoft and see if i can make any progress.
Edit: I am on OneDrive 20.064.0329.0008 (Standalone). Which funny enough has a copyright date of 2018. (Though I know it has been updated recently.)