Online Information Sharing (OIS) by Jimmy Lim

Performance issues with Virtual PC on laptop computers

Unfortunately, there are laptops where Virtual PC does not run well. 

Comment from user:

For VPC 2007, I am having performance problem with my NB compare with Desktops,

NB gives me a lot of mouse hessitation, it happen almost every seconds i move the mouse. NB is Intel Core2 Duo T7500 @ 2.2GHz, 2GB RAM, NVIDIA Quardro NVS 140M with 512MB memory. NB is running at full speed, full performance settings.


Desktop perform very well with the same image file .vhd copied from NB, mouse is moving smoothly as in the host. Desktop is Intel Core2 Duo 6600 @ 2.4GHz, 2GB RAM, ATI Radeon X1300PRO with 256MB memory.

The same image file had copied to another desktop (Intel Core2 Duo 6750 @ 2.67GHz, 2GB RAM, Intel on board display adaptor shared memory 256MB) which running Vista x64, it perform very well too.

I am just wondering about the NB problem:-
1) CPU problem? T7500?
2) Display had 512MB memory, shouldn’t be the culprit.

Any help is much appreciated.

The root cause of these problems is that these laptops are stopping system timers when entering low power modes.

Well, with Virtual PC 2007 there is one last option to consider:

  1. Exit Virtual PC program at taskbar
  2. Open %appdata%\Microsoft\Virtual PC\options.xml with notepad
  3. Find the <virtual_machines> section of the file and add this key:
    <enable_idle_thread type=”boolean”>true</enable_idle_thread>
  4. Save the file and exit notepad
  5. Start Virtual PC

Now when you start a virtual machine under Virtual PC, Virtual PC will fully utilize the processor in order to stop the laptop from entering a low power state. 

The upside of this is that you should see no performance issues.  The downside is that it will drain your battery power much faster than normal. 

As such, you should plugged in the power source and only use this option after you have tried all other possible solutions.


Wednesday, 26 March 2008 - Posted by | Microsoft, Virtual PC, Windows Server 2003, Windows Vista, Windows XP | , , , , , ,

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