Except that this isn't a race, is it? It's a tool to get things done. Honestly you guys who place so much importance in which phone does something a couple seconds faster just totally crack me up. And iOS fans are the worst at it, but Android fans do it as well. If I am deciding what car to get, the only time I really care if one is 4 or 5 Seconds faster is if I'm in a race. Otherwise, I promise you that the fact that your sports car will get you to work 5 Seconds faster than my pickup truck will not sway me into buying your sports car. The pickup truck does the work I need better than the sports car.
I have no issues with the phone being a second "slower" than and iPhone or a Pixel, overall the phone is smooth for a Samsung phone. Where I have the issue (and this might be more related to the developer of the apps) is the fact that I have to deal with lag and frame rate drops in games that an Iphone 6 can run smoothly on. This is supposed to be "top of the line" specs yet can't play a game without lag?
Go ahead, get an iPhone 6 and the S8+, play Marvel Contest of Champions on both and even play the line Tsum Tsum game (a game that isn't very graphic intensive) and see how smooth it is on iOS.
I still love the phone and i'm getting better battery life on it than any other phone, it can actually compare to the battery of my iPhone 7 Plus. At the end of the day though, iPhones are just more optimized, runs smoother and are more polished than any Samsung phone. I do like the new Samsung interface and I actually love that the icons are actually pretty uniformed by added a round bezel around all the ones you download. I've always hated the fact that every icon is a different shape and size on Android. I'm not one that likes using launchers and icon packs nether.
EDIT: To be fair about Marvel Contest of Champions, it lags on every Android phone and lags actually lags less on my S8+ than on the Pixel XL. So smooth even going through menus on my iPhone 7 Plus.