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Tweak XP with dual core for best performance.


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Computers that are running Windows XP Service Pack 2 and that are equipped with multiple processors that support processor power management features may experience decreased performance


That link is for the intel one, do your own search for the AMD systemzor


Disabling the patch method :

How to disable the new performance state policy behavior

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you install the hotfix that is described in this article, you may use registry settings to disable the new performance state policy behavior. To do this, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.

2. Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager, point to New, and then click Key.

3. Type Throttle for the new key name.

4. Right-click Throttle, point to New, and then click DWORD Value.

5. Type PerfEnablePackageIdle for the value name.

6. Right-click PerfEnablePackageIdle, and then click Modify.

7. In the Value data box, type 0. Make sure that Hexadecimal is selected in the Edit DWORD Value dialog box, and then click OK.

Note You can type 1 in the Value data box to enable the new performance state policy behavior.

8. Quit Registry Editor.

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