When I booted up my iMac this morning, I was presented with an update to 1Pwd 6.8 (I had 6.7.1). I allowed the update but ever since I've had spinning beachballs, slow Finder response, slow Firefox response, etc.
I did a System Diagnostic via Activity Monitor and the first item listed in the report was 1Password. I don't know if the report list items numeric/alphabetic or if it lists items by problem when it says they are "sorted by count". Would an extract of the 1Password Process from the spindump_sysdiagnose_2017.07.19_09-37-21-0700.txt help you to see what in the 6.8 update is causing the problem?
1Password Version: 6.8
Extension Version: Unknown
OS Version: Mac OS X.11.6
Sync Type: WiFi
Referrer: forum-search:Spinning beachball, slow Finder response after updating to 1Pwd 6.8