Microsoft KB Archive/824628

= Virtual PC runs slowly on a Macintosh PowerBook computer =

Article ID: 824628

Article Last Modified on 2/17/2005

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APPLIES TO


 * Microsoft Virtual PC for Mac Version 7
 * Microsoft Virtual PC for Mac Version 6.1
 * Microsoft Virtual PC for Mac Version 6.1.1 Update
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows 2000 Professional
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows XP Home Edition
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows XP Professional
 * Connectix Virtual PC for Mac 6.0
 * Connectix Virtual PC for Mac 5.0

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SYMPTOMS
When you run your Apple Macintosh PowerBook computer on battery power, Virtual PC may run slowly.



CAUSE
This issue may occur if the Allow processor cycling option that is in the Energy Saver control panel is selected. Processor cycling may cause performance degradation in the virtual machine. This performance degradation may be most noticeable during sound playback.

Note While this feature is available on some desktop Macintosh computers, there is no benefit in using the feature on a desktop computer, because processor cycling is intended to extend battery life in a laptop computer.



WORKAROUND
To work around this issue, turn off processor cycling or run the PowerBook computer by using an AC adapter. You can turn off processor cycling in the Energy Saver control panel.

Note When you connect an AC adapter, the Power Cycling feature is automatically stopped.



MORE INFORMATION
For more information about processor cycling, visit the following Apple Web site:

http://docs.info.apple.com/article.html?artnum=25170

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products. Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Keywords: kbprb KB824628

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