Have you tried turning off syncing of contacts with Gmail accounts/Outlook/Exchange servers, just as an experiment? Perhaps there's some protocol mismatch betw

Have you tried turning off syncing of contacts with Gmail accounts/Outlook/Exchange servers, just as an experiment? Perhaps there's some protocol mismatch between contactsd and external ldap or whatever they use servers. I thought of this not because of a cpu core craziness, but a strange symptom i had for many months. On one of my macs i could see known people only as their phone numbers, and on another mac i saw their names: i had contact syncing settings toggled on/off differently between the two macs, wrt Gmail and Outlook servers (and i didn't realize i'd put any contacts on those servers...thought they were all in MacOS contacts).