nnimap: Checking mailbox %s vs. Updating info for %s

[Chris Brierley <brierley@pobox.com>]

Is anyone else noticing problems with nnimap in Gnus v5.8.3 with
regard to speed in getting mail?  I've seen people post about
speed problems when Gnus gets into a state where it displays
"Updating info for %s" when getting mail rather than "Checking
mailbox %s" which is much faster.  I remember a discussion about
select methods and this being fixed in v5.8.3.

However, I've got a reproducable instance where it is still
happening.  I get mail over IMAP from three different servers, two
in gnus-secondary-select-methods and one foreign group (included
at bottom).  I find that if I move or copy mail from one server to
another, from then on that other server displays "Updating info
for %s" when retrieving mail, and is much slower than the others
which still display "Checking mailbox %s".  I wind up having to
quit and restart Gnus in order to speed things back up.  This does
not happen when moving or copying mail to a different group on the
same server.

Does anyone know what causes this and/or how to avoid it?

Thanks much!

,-----[ From gnus-secondary-select-methods
|         (nnimap "personal"
|                 (nnimap-address "localhost")
|                 (nnimap-server-port 10143)
|                 (nnimap-list-pattern ("INBOX" "mail/*"))
|                 )
|         (nnimap "ct"
|                 (nnimap-address "localhost")
|                 (nnimap-server-port 8143)
|                 (nnimap-list-pattern ("INBOX" "mail/*"))
|                 )
`-----

,-----[ Foreign group
| (nnimap "lbri"
|         (nnimap-address "localhost"))
`-----