This will probably be my last post on this forum, as i have moved on. You need to accept the fact this will never change NEVER! Timmy is out to make more products and more money for shareholders, his Apple doesn't care if your phone lags/stutters everywhere that would make him profit in the near future by you upgrading, and you will as will other users in these forums! if you think about it's smart, Apple users are easily manipulated by Apple IMHO that will never change, for one that leaves 10 will join. Your only hope is something comes out of the class action lawsuit
https://www.macrumors.com/2015/12/29/ios9-iphone-4s-lawsuit/
Even if that is not money hopefully the option to downgrade the 4S and other models to an ios of their liking.