Back when we outlined the iOS 4 features missing from iPhone 3G , we forgot one key bullet point: performance. As more and more two-year veterans of Apple’s phones have taken the plunge and upgraded to the latest firmware, slowdown and battery drain issues have become a common complaint, which is even more irksome when you think of just how little the update really adds to the UI

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Apple investigating issues with iOS 4 upgrade on iPhone 3G

