iPhone 5 Javascript Benchmarks More Than Two Times As Fast As iPhone 4S

AnandTech published the first SunSpider benchmark for the iPhone 5. This benchmark measures performance of Javascript in web browsers.

Lower is better, so the iPhone 5 with the score of 914.7ms outstripped all other devices measured in the test. Moreover, it is the fastest SunSpider test for a smartphone they have ever recorded. The new iPhone is more than twice as fast as the iPhone 4S that scored 2250ms and significantly faster than the Galaxy S III that scored 1442.9-1824.9ms.

Javascript is extensively used on websites so it is a common field of optimization and its implementation may have been improved in new iOS 6 that ships with the iPhone 5. According to AnandTech, the superior performance is probably a reflection of the improved memory subsystem in the Apple A6 processor.