Originally Posted by
eve6er69 I am still rocking a 6S. As long as it stays snappy I won't get rid of it. I usually update the software for a year or two and then stop. After that is when I notice a significant slow down. So needless to say I won't be updating to the iOS11 on this.
Keep in mind the newer iPhones have a more powerful and faster processor along with more RAM as opposed to phones below the 6s. The 6s should handle iOS 11 ok. Try it for 24 hours, if you don't like it, drop back to what you're on.
My old iPhone 5 does pretty good on iOS 10.3.1. A bit sluggish at times, but performs ok. It just needs a new battery.