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Have you tried simply rebooting it?
I'd try a 3rd party launcher first. I've never had a problem with lag on mine but I have almost always had some other launcher than Touchwiz.I'm running 4.1.2 and everything is laggy. From the keyboard to opening apps, everything takes a while to load or respond to my input. Is there a fix for this ? Will rooting speed up my note? What can I do?