The Javascript vs Native facts

http://sealedabstract.com/rants/why-mobile-web-apps-are-slow/

"But the real elephant in the room here is that in all these articles on this subject, rarely does anyone actually quantify how slow JS is or provide any sort of actually useful standard of comparison. (You know… slow relative to what?) To correct this, I will develop, in this article, not just one useful equivalency for JavaScript performance–but three of them. So I’m not only going to argue the “traditional hymns” of “wa wa JS is slow for arbitrary case”, but I’m going to quantify exactly how slow it is, and compare it to a wide variety"...