MCPE dropping FPS

my device: Acer A1-840FHD

processor: 1.3 GHZ (1.8 GHZ)
RAM: 2 GB

MCPE dropping my FPS else i have 40+ FPS and i looked at Nexus 7 2012 and it is worse than my tablet but it has +/- 50 FPS without drops.
I tried hard reset and without any other apps and still dropping. Im sure it is MCPE bug

i have bought MCPE and i read this: "Minecraft: Pocket Edition is a Universal App. Pay once and play on any of your Android devices"

so please fix this it is terrible while playing. Thx