CNET UK decided to spend its brief hands-on time with the iPad 2 by running the
SunSpider JavaScript Benchmark, which CNET calls "an increasingly important indication of overall performance. The better a phone or tablet is at dealing with JavaScript, the faster more complicated websites such as Facebook will run, which means your whole experience with the device will feel faster."
CNET found initially that the iPad 2 is up to four times faster than the original iPad, but not all this speed improvement is down to the upgraded hardware. The speed advantage dropped to a 1.5x boost when CNET updated the original iPad's OS to a beta version of iOS 4.3 that it happened to have lying around.