Optimization and Perfomance

This is my issue, i mean play for 5 or 10 min, the game begining get more lag and slow movement, my specifications of my tablet is:
PROCESSOR: Dual Core A23 1500 MHz.
RAM: 512 Mb.
OS: Android 4.2.2

This problem not happened on the before version, 0.11.1 any Build.
Podase Fix It

The version no is 0.11.0, is the newest 0.12.0 Build 1