David Pogue at the New York Times on the Kindle Fire 6.2.1 software update:
Sure enough: the home screen “carousel,” a rotating shelf that holds all of your books, magazines and movies, now stops on a dime when you want it to. It takes only one tap to open something instead of several frustrating ones. When you do tap something, it opens faster and more fluidly. Page turns are smoother, especially in magazines.
I’ve only played with the update for a few minutes, but it does feel faster. The Fire still has a lot of other problems, many of which can’t be fixed by software, but at least Amazon is working on it — historically, Kindles have received very few software updates over their lifetimes.