Performance issues with Virtual PC on laptops

If your Virtual PC runs in slow-motion try the following:

1. Stop running Virtual PC
2. Open notepad (or other text editor)
3. Open %appdata%\Microsoft\Virtual PC\options.xml (appdata is a hidden directory)
4. Add or edit <.virtual_machines.> section of the file and add this key:
   
   

    
   <.enable_idle_thread type="boolean">true
   eg. It should be on the same level as the node (just put it after the last <./virtual_network.> node)
   <.virtual_machines.>
   <.enable_idle_thread type="boolean">true<./enable_idle_thread>
   <./virtual_machines> 
   

   
   
5. Save the file and exit notepad
6. Start Virtual PC
7. Don't forget to remove the dots in the XML above

Thanks to Virtual PC Guy's WebLog.

Addition: Some extra performance on vhd-files (here) (thanks to Frank).