Help on improving isometric map

Getting Started Newbie Questions
#1

So I was able to produce an Isometric map, but the problem is it is slow in a Android Device, but I have no problem in iOS device.

how can I improve my isometric map

what I’ve done is

  1. create a set of tiles which is RAW tile(used to receive touch event)

  2. at the same time create a item holder(used if you want to put an item on it

  3. populate it

MAP is 21 x 11