Corner case where nov cache kills performance

["Rupa Schomaker (list)" <rupa-list@rupa.com>]

I've found a case where the nov cache just kills peformance.  Enter a
new group with lots of messages (say 3,000).  Delete 2500 of them.
Leave the group.  Re-enter the group (don't think you have to quit
gnus).   emacs CPU utilization goes through the roof -- I didn't have
the patience to wait.  I C-g the entry of the group, remove the nov
cache for that group, then enter the group.  I get into the group
immediately.

-- 
Rupa (rupa@rupa.com for normal email)
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