Apparently iPhone 3G users who decided to make the jump to iOS 4 have been left with some less than usable devices. According to TUAW, Apple support forums are filled with dissatisfied customers who upgraded their software expecting halfway decent results. As it turns out, iOS 4 has a cripplingly slow effect on the user experience. If you’re an owner of an iPhone 3G it might be best to hold off and stick with 3.1.3 and if you’ve already upgraded and you’re looking to go back, Lifehacker has you covered. Watch the video above at your own risk.