Mcpe don't use full device hardware and cause performance and FPS drop.
Based on my device Lenovo A850+
Octa Core 1.7GHz (2.0GHz overclocked)
1GB RAM (600MB free)
Quad core Mali 450 MP 500mhz
Based on my device hardware used in MCPE
4-6 Core only operate (sometimes cause only 2 core operate at full speed)
Use 300mb free ram
But graphics core all in work in mcpe
So the game very laggy and FPS drop suddently
Comments 3
Sorry for late answer,I can't screenshot because cpu always change frequency.I can't give screen record due the video more than 10MB.I will post the video at youtube.
Post the settings your running mcpe with and check to make sure you dont have resource hungry programs running in the background. Running in airplane mode will automatically arrest some process'.