RPG Maker XP Tips

Reduce Lag
One way of reducing lag during gameplay, is by opening the Task Manager (Ctrl + Alt + Del) during a Game Play, and selecting the Processes tab.

Locate the Game.exe process, right click and select 'Set Priority' (under Windows XP Home) and increase it to 'High'.

This will need to be done on every Game Play, though it should remove a lot of lag and slowdown.