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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: multi-threaded Emacs
Date: Wed, 10 Dec 2008 13:18:36 -0500
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      Why would you like
    to reduce the amount of switches using a counter?

Because it takes a substantial time.  Just swapping the specpdls
takes time.