Every update on my iPad just seems to slow it down. I learned this the hard way with my iPhone 3G. By the time I upgraded it to iOS 4, the phone literally wou

Every update on my iPad just seems to slow it down. I learned this the hard way with my iPhone 3G. By the time I upgraded it to iOS 4, the phone literally wouldn't work anymore. It would ring, I would touch the answer button repeatedly and nothing would happen. By the time the slow-as-molasses phone responded to the answer button, it would go to voicemail. It happened to a lesser degree with my iPhone 4 and I didn't have my 4s long enough to experience it. Basically I think Apple just assumes people are going to upgrade their Apple phone every 18 months, which is a stretch considering major US carriers have clamped down on subsidized 18 month upgrades.