Tackling slow address autocomplete in Mail
When you begin entering recipient's e-mail addresses in the "To" field for new messages in Apple's Mail client, the program will attempt to autocomplete them to make addressing your messages easier. This usually is a pretty quick process; however, there are some instances where slowdowns can occur. When this happens you might enter a few characters of a contact's name or e-mail address, and Mail will then show the spinning color wheel and not respond, which may occur for a number of minutes.
If this happens you can likely fix the problem by checking either … Read more