Re: RMAIL slows

[Richard Stallman]

    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.