Sunspider, Browsermark, and Guimark 3 Bitmap were used to test Web browser performance. Geekbench was used to benchmark the processor and GLBenchmark 2.5 was used to test graphics.
PCMag found that the iPhone 5 outperformed all previous iPhones, the Samsung Galaxy S III, and the Motorola Droid Razr M.
A phone's hardware performance can't be taken in isolation, but it's definitely a piece of the puzzle. Based on these benchmarks, the iPhone 5 lives up to the promise of being twice as fast as the iPhone 4S. It's also, for now, the fastest handheld computer sold in the US.
Check out the results of their tests in the charts below!