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From: Richard Stallman <rms@gnu.org>
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Subject: Re: customize-apropos-options takes forever...
Date: Fri, 07 Jul 2006 15:30:58 -0400
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	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.

    I feel comfortable with the lisp debugger, but not with gdb etc.

You can try using debug-on-quit and the Lisp debugger.  If the
slowness is at Lisp level, you would find it that way.  But I would
guess it is at the C level.  If so, you could only see it with a
C level debugger.