To solve this dispute, just simply start Siri, pull up Control Center, pull down Notification Center, send a message, and go to Safari and go to the new tab view, and just watch the animations. With reduce transparency enabled this doesn't really lag, but with transparency it is very choppy. I would estimate it runs anywhere from 20-40 FPS in these situations pertaining to the translucency. Go into the tab view with an iPhone 5 or 5S, then do the same on your 4S, it is incredibly smooth on the 5/5S, where the 4S chops and drops frames. Badly. Next compare Control Center and Notification Center on the iPhone 5/5S to the iPhone 4S. Pretty much perfect 60FPS on 5/5S, but like 20-40 FPS on the 4S, depending on the situation. Siri is also perfectly smooth on the 5/5S, while it stutters on the 4S. Trust me, I have seen this all in person. The 4S is definitely usable, don't get me wrong, but it is just simply silly to say that "There is no lag" on the 4S.