OnyX can also be used to carry out maintenance tasks, such as verifying your system's permissions, rebuilding the spotlight index, or cleaning out the browser and other application’s caches. Modifying the route in which screenshots are saved, and the format used, increasing or lowering the viewing speed for windows on the Finder, or deactivating the graphic effects, are three of the basic functions that can be changed using the program. Onyx is one of the most complete applications out there for the maintenance and optimization of your operating system, doing things such as checking your hard disk's start-up volume, or any errors that it may find.