Android – Optimizing device performances with Greenify (without root)

I guess most Android users once tried to make their device more responsive by installing some tasks killer or battery improvement apps, that runs in the background.
But after trying some of those, I realized that, in the long run, most of them were causing responsiveness issues on my devices.

The slowdowns are caused by some apps that automatically restart after being killed by the utility app. Moreover, by running constantly in the background, all these utility apps are using some of the precious memory they claim to free!
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