BTT seems to have some issue with Dropbox sync. I previously fixed the problem by deleting cloud data and resetting sync on all three of my Macs. However, the problem has cropped up again. The problem evidences itself by BTT consuming 100% CPU for an extended (indefinite) period of time. Other applications experience a moderate amount of slowness in response. Stopping and restarting BTT by itself has no impact on the issue, nor does rebooting.
I'm currently on version 2.846, MacOS 10.14.4. The problem occurs primarily on my 2018 MacBook Pro, although I do see the same metrics on my Mac Pro 2013 and Mac Pro 2011.
It's difficult to enter text in this very form while BTT is running. I'm going to try running BTT with sync off for awhile to see if that helps.