I know you already rejected the 7.2 Beta but I caught a problem which might be related to the high CPU usage
or is another issue you could fix as well.
When I try to open the internal console of 1P it just shows an empty console window.
At the moment this console window gets closed, 1P crashes.
1Password Version: 7.2.570
Extension Version: 220.127.116.11
OS Version: Windows 10 1803 17134.165
Sync Type: Dropbox