I noticed a not so smooth animation when I press the recent apps key. I'm not sure if this is android or samsung or nova's fault but it's just a very very little annoyance. I'm from ios and BB10 and animations on that OS are almost perfect. But still, this device is so beautiful and perfect for media consumption.
I don't know if this will help but change the Nova setting for animation speed to "Faster than light". See if that helps.