Keep a cool phone and a cool heard; it'll improve your performance
DU Phone Cooler&Cooler Master is a free app from DU Apps. It speeds up your phone and improves its lifespan by giving you the ability to prevent your phone from heating up. It does this through a variety of functions, some automatic and some manual, that let you reduce CPU usage, nip problem apps in the bud, and see your phone's actual heat up to the second. It has a few other frills too, like monitoring charge time.