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From: Richard Stallman <rms@gnu.org>
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Subject: Re: customize-apropos-options takes forever...
Date: Thu, 06 Jul 2006 09:32:27 -0400
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Xref: news.gmane.org gmane.emacs.devel:56632
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/56632>

    Emacs 22 has a lot more options, of course, and more faces and buttons and
    such, but it still feels like things are less efficient now. In emacs -Q,
    there are 4698 lines in the buffer in Emacs 22; in Emacs 20, there are 2333
    lines (about half). But Emacs 22 takes *far* longer than twice as long.

Probably something really is wrong.  The question is what.

Would you like to try running Emacs 22 under a debugger
and stopping it a few times uring this operation?
If you notice a place that shows up frequently in the backtrace,
that might be the place that is using the time.