How do I increase the FPS on my mobile phone?

Hi guys. I have created a simple 2d game for mobile phones. The game is VERY SIMPLE, few animations and sprites on screen but the game runs so slow! I tested it on Cocoonjs on my iPhone 4. Any solution for this? Or just is my phone? Thank you and sorry for my bad english!

Try reducing the size of the images,

See if your mobile is blacklisted,

and finally see the programming, you can put a small piece of code to see if this is the problem.

Another thing you might want to try is destroying unneeded objects like the ones that aren't visible. If the game is a side scroller like flappy bird, you could put a line of code in that destroys anything that is passed the 0 pixels mark. Also, like Iceangel said, check the size of your images. Depending on how little they are, you might even want to make them a bit bigger (i.e makes more sense to have 1 solid ground sprite than many instances of a ground sprite on screen making the processing heavier)

Worst case scenario, you have a crappy phone!

Hope it helps!

Also I would recommend checking your game through the debugger to see if any unexpected things are happening and what part of your game is taking up the largest amount of memory/processing time..