I'd say this is faster than my Note 5. Not by a huge margin, but it's noticeable. I think the consensus here is that you got a lemon, but I'm guessing you're not of that mindset even though most personal accounts and pretty much every review states the opposite of what you're complaining about.
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No, it's Marshmallow. I have 2 S7 Edges, one I returned and the new one I'm using now which is fine. Both are/were noticeably slower in navigation than Lollipop. Most people just won't notice it.