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From: Sven Joachim <svenjoac@gmx.de>
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Subject: Re: Q: High processor load with change to GNU Emacs 22 under Windows
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Eli Zaretskii <eliz@gnu.org> writes:

>> From: Torsten Zirzlaff <zirzlaff@nienor.s.bawue.de>
>> Date: Sat, 06 Oct 2007 00:07:48 +0200
>> 
>>    If I open a C or C++ file in Emacs 22 I encounter a very high
>> workload. On a single porcessor system GNU Emacs uses 100%
>> of the CPU while I do nothing. If I <Ctrl>+g I stops shortly
>> and starts again. On a multiprocessor system it uses up a
>> complete CPU. This only happens if I load a C/C++ file.
>
> Does the problem go away if you start Emacs with "emacs -Q", and then
> open a C/C++ file?  If so, maybe you load in your .emacs some optional
> package that causes this problem.

One particular package that causes this problem is semantic prior to
version 1.0pre4 (see etc/NEWS).