If you have 512 MB or more of RAM, you can increase system performance by having the Windows XP ‘Core’ kept in the RAM instead of paged on the hard disk.
Go to Start -> Run – Type regedit and press enter – On the left hand side tree, navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\
– On the list on the right side, look for an entry called ‘DisablePagingExecutive‘
– Double click it
– Press 1 on your keyboard
– Click OK
– Exit regedit and reboot the computer
To revert to the default setting, follow the same steps as above, but this time, press 0(zero) instead of 1 on the keyboard.