>If you're using imap-uw, this is because the IMAP server from UW is horribly
>inefficient with large mailboxes.  Even for a mailbox listing, it creates
>temporary storage for all that scanning, and can even copy the entire
>mailbox to /tmp and back again for some IMAP commands.
>
>It also has a problem with memory chewing.  It reads in a whole lot of data
>for `caching' ... but that end up making the processes 30MB or more in size
>for very large mailboxes.

Sounds like patching hte DESCR to mention the performance limits and
non-scaling to large mboxes in the DESCR would be a good idea. 
Would fit well right after `reference implementation' :).

How does cyrus compare?