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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: RMAIL slows
Date: Sat, 23 Apr 2005 18:24:26 -0400
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    OK: over four deletions (50 messages each, plenty of time to suspend
    for GDB), the constant is "rmail-reformat-message".  Here is what I
    saw:

This is interesting.

I think you said it was spending most of the time in regexp matching.
Is that right?  If so, can you determine what regexp it spends most of
its time matching?  That way we could see precisely where it is in the
code.