To boost the performance of your Kindle Fire tablet, clearing cache, cookies, and browsing history is an effective solution. The device stores temporary files to help websites load faster, but these can slow down your device or take up valuable storage. By following simple steps in the Silk browser or app settings, you can clear the cache, free up space, and improve speed. Additionally, clearing the cache of individual apps can also fix performance issues and free up storage space. A factory reset will also clear all data, including cache, cookies, browsing history, and installed apps, but should be used as a last option if other methods don't resolve performance issues.