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In this video I compare iPhone OS 3 to iOS 4 in a head to head speed matchup. I loaded a fresh install of iPhone OS 3.1.2 on my iPod touch 2G and then did the same with iOS 4. I ran several tests of the Safari browser that includes repeatedly opening websites over Wi-Fi and filming the results. I then did some general tests of the Maps application including timing the loading time and general speed and responsiveness. Lastly I timed opening up the graphically intense application Real Racing multiple times on both operating systems to see if there was any difference.
Many people have reported that apps seem both faster and slower in some cases on iOS 4 so I decided to do a full test of a few major aspects of the operating systems to try and shed some light on the situation.