Why is my mail so slow to populate?
iMac (21.5-inch, Late 2012), OS X Yosemite (10.10.3)
Why is my mail so slow to populate?
iMac (21.5-inch, Late 2012), OS X Yosemite (10.10.3)
Is this when you are opening Mail or when you are trying to receive e-mails?
Try rebuilding the mailbox.
If that doesn't work, try re-indexing the mailboxes. This can take awhile if you have a lot of mail.