Mail checking a bit slow

[David Woodfall]

I've been experimenting with the sidebar today and it works well.

One problem though is that the mailboxes new mail count seems a bit
slow to update (maildir).

I've tried a few settings and I currently have:

unset mail_check_recent
set timeout=1
set mail_check=1
set mail_check_stats
set sidebar_new_mail_only = no
set sidebar_format = '%B%?F? [%F]?%*  %?N?%N/?%S '

After I receive new mail it seems to take upwards of 30 secs to
actually put the new mail count in the sidebar listing.

Is there a way of speeding this up? I'm not using IMAP or anything,
just plain maildir.