I've been using my refurbished nexus 10 for a day now and am a little disappointed in it being jerky. Its almost like my old galaxy s2 was before project butter. The jerking happens quite often. It even happens when simply scrolling from screen to screen on the home screens (with only the search bar widget on the main screen & a couple of recommendation widgets on another). The tablet also seems slow when changing between users - is this normal? It would take 3-5 seconds to be able to unlock the next users screen, when changing between the two. Is this to do with the apps loading up behind the lock screen?