I find that too, particularly with my main account which has the largest number of stored emails in in - and sent - boxes and I assume therefore the biggest storage file. It just hangs there for half a minute (not a whole minute!)
Your comments prompted further footling. The anomalies I have are solely in the Outlook address book that I imported and not the "personal" etc that exist. If I drag and drop items from the imported one into the personal they move over, but then ...
I have installed 102.0.3 and as I have posted in support, the address book is still displaying weird behaviour. Mainly that the search does not work - enter anything in the search box and nothing happens (when it should bring up entries with that nam...