If you have more than 256K of L2 cache, NT may not be using all of it. To correct this:
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Control\SessionManager\MemoryManagement
Name:
SecondLevelDataCache
Type: REG_DWORD
Value: 0 default for for 256KB of L2 cache
If you have more cache, adjust the value by double-clicking SecondLevelDataCache to bring up DWORD editor. Click Decimal. Enter the amount of L2 cache you have and click OK.