Re: Exchange 2007 Issue Entering Large Groups

[Daniel Pittman <daniel@rimspace.net>]

Jake Colman <colman@ppllc.com> writes:

> This post is a follow-up to a series of posts regarding issues using
> Gnus with Exchange 2007.  Most of the IMAP issues have been fixed with
> the patches already included in the CVS version of Gnus.  The major
> remaining issue is this: entering a group with a very large number of
> read messages takes a very long time.

I recently upgraded my IMAP service from Cyrus to the Zimbra IMAP
server; it uses sparse UID allocation for messages which causes some
interesting behaviour in Gnus -- I trivially get groups that Gnus
believes have 65,000 new messages or more.

The biggest performance killer, since I don't use the agent, was the
setting of `nnimap-prune-cache', default `t', which causes an enormous
number of regexp searches in the cache.

I set that to `nil' and found my performance radically improved for
normal use, although there are still rare occasions that range
operations cause delays.

I intend working on the prune code at some point, and I am not sure it
will be what is slowing y'all down, but it may be worth a try.

Regards,
        Daniel