I'm on my second rMB 2016 (unrelated to this issue) and it's working beautifully. It's an m7 configuration so I'm sure it's nothing to do with the power. On both this one and the previous one it feels like half the time I need to swipe two or three times to get the back feature in Safari to register. My old 2010 Macbook Pro would glide through pages and the softest rub of two fingers and it was great. I'm not sure if perhaps I'm doing it wrong but I feel as if I've tried everything, sometimes it works perfectly first try and often times it doesn't. I have tried disabling and reenabling the feature and even changing it from default scroll left/right with two fingers to two/three finger swipe and it's the same responsiveness. Does anyone else experience this or have any tips?