Why game in cocos2d-x 1.0 fps 40+, now in 2.0 fps 30+?

Why game in cocos2d-x 1.0 fps 40*, now in 2.0 fps 30*?

You sure need to give more explanation than that if you want help from others.

coco2d-x 2.0~I my game run in android, fps 30 to 40 ,
but use coco2d-x 1.0 run in android, it can be fps 40 to 50.
I use defy to test.