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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Spurious unresponsiveness
Date: Sun, 15 Nov 2009 19:53:07 +0200
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> From: Andreas Politz <politza@fh-trier.de>
> Date: Sun, 15 Nov 2009 07:35:20 +0100
> 
> after hacking around in some C code for hours, I notice frequent periods
> of 3-5 seconds, in which emacs is busy doing something else.  This is
> very irritating.
> 
> Does someone have a guess, who the evildoer may be ?

Set garbage-collection-messages non-nil, and see if you see any
messages during these periods of unresponsiveness.