Lulwut. I have 3 android flagships. The One Plus Two, the Nexus 6 and the Moto Force. I even tested out the Atom processor for a month. None of these have any degree of lag. I'm fairly certain you cannot quantify lag in layman terms like you're trying to do. Just because you feel the 6S is *optimized* for the obsolete iOs, doesn't make it so. The numbers speak. Why benchmark? Because chip benchmark tests show us what a processor is capable of, the threads it can handle and so on. You get the idea. There are over 20 standard tests that can show you the numbers. Look it up on Tom's Hardware or GSMarena.