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From: Richard Stallman <rms@gnu.org>
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Subject: Re: RMAIL slows
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    The primitive that appears in the backtraces from the older instance,
    but not the newer is

	re_match_2_internal

    which is in emacs/src/regex.c.  

That is the inner function that does regexp matching.  Could you
please show a backtrace of the inner 5 or 10 C stack frames that call
it?  Then we will see which C primitive was called.

Also, by looking at the args to that C primitive, you can see
what the regexp is.