**Mod Note**: Spoiler What started out as a discussion for DU Speed Booster (available in the PlayStore) evolved into a very informative discussion about Task Killers, Ram discussion, killing apps and the like. As a result, the thread is now stuck here, as this is a very good thread about them So in a roundabout way, thanks to @AppleUser for starting this thread We also have another thread about Android Task killers here (a few years old, but still excellent nonetheless). Also, some shortcuts to helpful posts in this thread: http://androidforums.com/threads/pu...-optimizers-and-the-like.896663/#post-6858083 http://androidforums.com/threads/pu...-optimizers-and-the-like.896663/#post-6859379 http://androidforums.com/threads/pu...izers-and-the-like.896663/page-2#post-6860024 Of all the apps which kill background apps, stop auto-starts, and empty caches, DU Speed Booster seems to be the best. Nice interface, works quickly, on repeat use during the same power up it documents improvement, and other apps rarely find issues after just one run of DUSB. However, Battery Doctor (or some other app) put up a flag indicating that DU Speed Booster (DUSB) has used 50% of the power in the antecedent hour. So is DUSB not worth using ? Did it only consume such power during the "cleaning" ?