I have had pervasive problems with Address Book stores on Macs for years now. Psychotically slow operations, ten-second hangs, sync failures, endless sync failure loops, and general thrashing are not hard to find on any system handling more than a few thousand cards.
If there are substantial Notes? Good night. Supercomputers brought to their knees.
If there are substantial Notes? Good night. Supercomputers brought to their knees.