The whole system hums along at 60fps now, and while the difference of a few milliseconds might sound like small potatoes, it becomes glaringly apparent the moment you run Jelly Bean next to an ICS device.
The fact that such a small phone with rather "budget-friendly" specs can run Jelly Bean without too much concern is a fact-check to manufacturers that claim their older devices can't be upgraded to it due to fears that it won't perform properly.