Enthusiast site Anandtech has taken Apple's new iPhone 5 through its paces and found a dramatic jump in JavaScript performance that is certain to be helping the latest version of Mobile Safari test "twice as fast" as the previous model. Other iOS device owners report that some of the improvement comes from iOS 6, though not to the levels seen with the A6 dual-core processor. The iPhone 5 broke the record handily for smartphones using the SunSpider JavaScript benchmarking tool, bringing in a score below 1,000 for the first time.
