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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Is it just me, or did 21.3.50 get a whole lot slower?
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    > 	emacs (both 21.1 and 21.2.90, and others) does get really slow
    > 	when (length load-history) touches 290--300ish.. which frustrates me,
    > 	but i guess that can't be helped.. (?)..)
    > 
    > Which operations get slow?  Who knows whether this can be helped,
    > until we investigate it.


    I shall look into profiling etc. and get back to this list with
    precise statistics re: speed vs. (lengh load-history).

I see I did not choose my words clearly.  I am sorry.

The first question is, which *user-level* operations get slow in this
situation?  That you should know from simple observation.

Looking at the code in one of those user-level operations might lead
you pretty directly to the primitive that gets slow.