We're glad to give a brief introduction of our new project Open Aphid. It combines the power of JavaScript and Cocos2d-iPhone for native game development on mobile devices.
Please read our blog to find out more: http://openaphid.github.com/blog/2012/02/20/javascript-and-cocos2d-a-sneak-peek, which describes the architecture of Open Aphid and includes a performance test on Open Aphid, Cocos2D-iPhone and ngCore.