Yep. It's not enough to maintain 60fps (which, even in 2013, isn't always possible); if you don't want scrolling through a large amount of content to feel weird and unnatural, you really should copy the native acceleration curve, something which I have yet to see done for iOS (even Apple's own JavaScript has screwed this up). Since iOS at least has supported -webkit-overflow-scrolling: touch for years now, there's usually no point.