Disable performance counters to tune-up Windows XP
Windows XP has a Performance Library (perflib) tool that continously monitoring the performance information of the system and this data is continously is being written to the Windows registry. This performance information is used by the performance monitoring tools like Performance or third party third-party desktop widgets and gadgets.
Click Start, click Run, and then type perfmon.msc in the Open box or go to Control Panel, then Administrative Tools and click Performance icon.

There are a lot of performance information that is continuously being written into the windows registry. If you do not use any kind of performance monitoring desktop widgets or gadgets that monitor and display performance data then you may want to disable the performance counters.
After disabling the performance counters wou will not see any performance info in any performance tool that uses Performance Library (perflib). Performance tools report the values either 0 or 100.
Click Start, click "Run..." and type "regedit".

In Registry Editor go to this registry key:
HKEY_LOCAL_MACHINE \SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib

Add a new DWORD Value DisablePerformanceCounters. Set the value of DisablePerformanceCounters value to 1 and reboot your computer.
You can also disable performance counters with this Extensible Performance Counter List tool. Download and install the Extensible Performance Counter List (Download link).

Select each counter in turn in the "Extensible Performance Counters" window and uncheck the "Performance Counters Enabled" checkbox. You had to do this with each counter.
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