[Q] Keep App in Memory

Is there an easy way to keep app in memory. Another Installable app for managing all the writing will be useful.
I like to keep Phone app in memory siince I have UberSync (great app) and when someone rings, phone just hangs for 30-40 seconds until the photo appear and I can't answer it, so I like to keep it in RAM so it don't need to load every time when someone is calling.
BTW I have Android 4.3 and rooted

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