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Windows will normally limit the amount of RAM that can be locked for file system operations. This setting allows you to modify the automatic value.

Open your registry and find the key below.

Create a new DWORD value named 'IoPageLockLimit' if it does not already exist. Set the value to equal the maximum number of Kbytes to be allocated to I/O operations as per the table below:

RAM       IoPageLockLimit
(MB)       Decimal    Hex
4           4096     1000
8           8192     2000
16         16384     4000
32         32768     8000
64         65536    10000

As with all performance related changes, get a baseline measurement using performance monitor and then make your changes in small increments and retest the performance after each change.

		(Default)	REG_SZ	(value not set)
		IoPageLockLimit	REG_DWORD	0x00000000 (0)

	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memo...

Related Tweaks

• Optimize the System Cache Size (Windows NT/2000/XP)
• Improve Core System Performance (Windows NT/2000/XP)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.