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From: Richard Stallman <rms@gnu.org>
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Subject: Re: update-subdirs and lisp/term
Date: Mon, 28 Sep 2009 17:58:41 -0400
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    > Omitting this directory speeds up searches for other files.

    This might have been a good reason back when term/ was the only
    subdirectory in lisp/ (Emacs 19.x).  But nowadays we have 21
    subdirectories besides term/ (and soon we will have 5 more).  Does a
    single directory really make a difference?

It makes some difference; why make even a small slowdown
for all the users just for a small simplification?

Perhaps it would be useful to design some other way to
speed up the search for files.