Sure it is, it must be because you keep repeating it.
I know quite a few people with S7's smf not one of them moans about how slow it is...in fact most comment on how great it is.
So it's not actually a fact at all, you're the only person here asserting such and there's a heap of people here who own s7's too.
Facts are things that can be verified, kind of of like the definition of a smartwatch, someone can say "that's not a smartwatch" but you can go and check the definition, show it too them and they shut the hell up because it's verified, it's a fact.
Opinion doesn't equal fact.
The android/s7 lag is a myth until verified.