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Don't waste your time downloading apps that clear your phone RAM. Your phone is designed to manage its memory efficiently already. Such programs will actually degrade your system performance. One thing you can do, if you like, is clear your list of recent apps every so often. I've noticed this helps with the speed of my old LG G3.
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Some phones like HTC, LG and Samsung come equipped with cleaners. Outside of those, I would fine your point very valid. Task killers are nothing but battery drainers and degraders if you think about. Most apps will just restart right back which is why it's a useless app.