As stated above, iOS 7 on my iPhone 5 doesn't have any lag at all, though it does have a little bit on the iPad 3. Apple made iOS 7 available to older devices even though they tend to show lag due to their outdated processors, but the latest devices seem to run it without lag. It makes perfect business sense to offer the new OS for use on some older devices, even though it will be slower. Apple should give people the option to upgrade older devices, but they should warn them it will be slower. And Apple should also make it easy to opt out of updating by allowing the user to prevent automatic download and annoying update reminders!!!!