That's a funny commercial, but maybe he should try a full settings restore (factory defaults, no restore of backup) of iOS 4 before giving up. It looks like he had a large music library, 6 open tabs in Safari, and a ton of email saved to the phone. Start with a fresh phone and re-load it and see if the problem clears up. It's most likely a remnant of a huge Safari cache, iPod library, and Mail.app account that is performing badly after the upgrade.