i think you and Tarototh are correct ,
however i think the apps are really working as well ,
coz i just bought a new phone (Lenovo A7000 Plus)
and it has some games installed already ,
i tried to play one of the games , it was ASPHALT 8 Airborne
and it was really suck! because i can't play it, its very damn
slow , i don't know where is the problem coming from, since the phone is brand new.
i tried adjusting the Gameplay settings but its no good at all, dont know what to do
so i gave up.
however just to cut the story short, after installing the DU Booster App , (i saw the app ad while playing piano tiles 2).
i am now able to play the asphalt with no problem ,