Originally Posted by mgmueller
Latest version of Jellybean and enough storage left.
And the lag is not just in the Kindle app.
It seems slow whenever processing lots of files.
Easy - You have too much in the cache. You'll want to go through each app and clear it in App Info. It'll make things much more snappier again.
On rooted devices with the ClockworkMod Recovery, it is as easy as pushing a button. Which IMO, is the best reason for rooting devices as you can't do this very easily otherwise.