The only known cases where ezPower runs slow (laggy) is caused by firewall/security software scanning everything. This makes some functions, like a z-out seem to freeze because it's taking to long. Some reports would also take a long time. Version 11, in the XP days, stored the ezp folder inside the Program Files directory. After XP, Windows doesn't allow that and redirects any file commands to a 'compatibility' directory. I would guess the Windows redirection has a overhead cost that slows file access down. Newer versions store all the data in a different directory. My suggestion would be to purchase the "Update to Current Version" for $79. Version 11 was built before Vista and Windows 7. It's to outdated.