[Dovecot] 1.2.11, mbox, new mail

[Stan Hoeppner]

With 1.2.11 and mbox storage, the delay time in pulling new mail headers to
the client from imap folders seems to be directly proportional to mailbox
size, regardless of the number of new messages.  At present, if the mailbox is
large, pulling new headers is rather painfully slow.

Is this expected behavior?  Especially given that the client already has all
the "old" mails in the folder cached, and thus wouldn't be asking for them?

Is there a setting(s) I can change to optimize/fix this?

--
Stan