Originally Posted by Jessica Lares
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.
Still: I don't have any lag on other Android devices, with way more apps.
On Sony Tablet P (still one of my favorites) I've got a 64GB Micro SD card, almost entirely filled with apps and content. No lag at all...