Out of curiosity, I checked out an app called CM Security that is supposed to clean up files and such while also reallocating RAM space. First, the iPhone does a great job of managing RAM memory. It needs no help that probably does more harm than good. Also, this app did it's "cleaning" by deleting cache from apps like Facebook and other 3rd party apps that build up cache. Many apps need that cache to work properly. Without it your phone has to work harder to do the things it needs to do.