After about 15 MCPE Nights the game begins to slow to a crawl. I began to scout around outside my house and found massive amounts of Creepers, Spiders, Skeletons and Zombies waking around in huge Amounts. I killed most of them and found that it increased FPS a little.

I think the spawn rates need tweaking as there is just way to many mobs causing it to lag.

Device: HTC One (M8) with android Kit Kat 4.4.2
MCPE Build: Build 4