One of the main strengths of the Nokia Lumia gen 1 were their speeds (despite only being single core). They were just utterly nippy and responsive. The new Nokia Lumia 920 continues that tradition by being just that much extra quicker (being WP8 and having dual core).
Once you get used to having no lags, you just see it any time there’s ‘delay’ in another device. Some people won’t notice it, but when you start getting used to it, it’s very pleasant.