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From: Chong Yidong <cyd@stupidchicken.com>
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Subject: Re: emacs hangs in jit-lock
Date: Sun, 03 Dec 2006 19:19:04 -0500
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Xref: news.gmane.org gmane.emacs.devel:63252
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Richard Stallman <rms@gnu.org> writes:

>     A non-nil setting may be useful for some situations, but nil is safer and
>     more desirable for laptop use which is becoming the more prevalent
>     machines nowadays.
>
> Have people found that a non-nil value causes a significant increase
> in power drain?

It's not trivial to quantify how much power drain stealth
fontification produces.  But several people have reported that it
causes their laptop fans are turned on, which means the consumption is
not negligible.