Another major enhancement we've just learned about with the announcement of Jelly Bean is called Project Butter. Butter (so named likely due to the colloquialism "smooth as butter") represents a new, more efficient processing framework for Android's latest and greatest iteration, making the OS much faster (allowing animation up to 60fps). Android 4.1 also makes apps more responsive, reducing touch latency and "anticipating where your finger will be at the time of screen refresh."
"How is such an enhancement possible?" I can almost hear you wondering. Take it from the Android developer site: