Having all other apps closed but Lecture Notes and Myscript calculator in multi window, this thing really dogs. Myscript seems to be OK when both windows are open, but writing in lecture notes is laggy as hell. Close the calculator and all is fine again in LN. The performance and lag is seen elsewhere too, but this is the worst. I swear, when I first booted and played with it, it seemed fine. Applied the update that was supposed to help with lag and it got worse. Jesus samsung. This is bad. If I weren't afraid of bricking this device because of lack of warranty, I'd root it and speed it up. Although, as is, it's pissing me off to the point I don't want to use it anyway, so a $400 brick wouldn't be that bad.