[Q] Slows down on games?

Hello everyone, just wondering if it's just me, or this phone really slows down on games? Been playing FF IX, its not that heavy on grapichs, but the phone slows down at some scenes. Also i already tried checking/unchecking the video optimization for games and still no luck. I came from xperia z2 but I didn't experienced this kind of lag, although this device has 6 cores.. Any help would be very much appreciated..

Btw im using the h960 variant with 64gb internal running 5.1.1


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