This freeware application promises to boost the performance of your Windows XP computer, but our tests found few bonuses and many flaws. Tweak Mechanic sports a basic and simple interface with radio buttons for eight options. Tweaking your XP, cleaning up junk files, improving Internet speed, and restoring Registry settings are all listed, but none are explained. Most offered tweaking features such as autoend tasks, the ability to tweak a hung up application, and the ability to increase speed for menu drops are normally and easily accomplished using Windows system applications. The poorly designed Clean Up Junk option fails to mention that the listed text lines are clickable shortcuts. Our tests failed to prove the Internet Speed option actually increased upload or download speeds. The listed help file is actually a shortcut to the company's Web site program-information page. Any level of user looking to tweak system performance can find many more beneficial and dependable utilities elsewhere.