One of the developers in my team has an SGS7 Edge as a personal device. I played with it yesterday.
In scrolling through CNN there was noticeable stutter. My iPhone 6s Plus, a six month old phone, was totally smooth scrolling through the same site. By no means a *performance test* but indicative of past history with all my Samsung devices.
This was a new phone. Two weeks old.
I can't imagine what will happen with the first OS upgrade. My Note 4 was a BEAST on Lollipop and a complete mess on KitKat.