Touch is delayed and low fps on samsung devices

Hi, i am building a 2d pixelated game.
I have allready published the game, its name is “Eggies World”. A strange thing i noticed when testing it on a friends galaxy s3, and my moms galaxy s5 (which is a pretty new phone), is that on both phones fps is below 15… And on my friend’s s3, the touch is delayed alot!

I’ll be happy if someone can tell me what is the reason it may happen (:
Thanks,
Tal.

Can you help me guys, please?

We’d need more details of why it’s slow. Perhaps there’s an inefficient piece of code somewhere or some function is being called too many times resulting in an overload? Without more details, or example code, really hard to help.