I just tested my game on two devices, an iPhone 4 and an iPhone 5 via CocoonJS.
While the game on the iPhone 5 runs flawless, usually at 60 fps, on the iPhone 4 the game runs poorly, at 15-25fps.
The thing is I'm not using physics in my game.
Anyone familiar with fixing non-physics related CocoonJS performance issues in the iPhone 4?
I will send ludei an email later today about this issue.