Early JavaScript benchmarks from iPhones running a beta of iPhone OS 3.0 suggest the new version will bring big speed gains to web apps running in Mobile Safari, even on existing iPhone hardware. With an average 3x speed improvement, some individual benchmarks reveal as much as an 16x increase in execution speed over the existing version of Mobile Safari in iPhone OS 2.2. Likely leveraging the new Nitro (née SquirrelFish Extreme) JavaScript engine currently in the Safari 4 beta, the new version of Mobile Safari can really plow through some JavaScript code.

Source:→ Ars Technica