my iPhone 6s is starting to feel a bit slow, probably because I haven't done a full format in two years and also because I always run low power mode. I turned it off for a couple of days and it really sped up EVERYTHING to "brand new" feeling. 

I guess discord and safari is now too demanding to run at a locked 60fps with everything loading almost instantly on a 1.3ghz dual core ARM cpu from 2015 lol