4 ms·On my iPhone 4, iOS 6 is about 10% faster in the SunSpider test than iOS 5.1.by weiran 14y agoOn my iPhone 4, iOS 6 is about 10% faster in the SunSpider test than iOS 5.1.masklinn 14y agoSo around 2000ms? I think we can pretty safely discount the improvements to the JS engine for the 914ms of the iphone 5 then.se85 14y agoNot quite, although your "probably" right.