iPhone users who are experiencing sluggish or slowness on their devices should downgrade or restore to 9.3.5 before Apple stops allowing the downgrade (expected soon). This is for anyone before the iPhone 7 or 7 Plus. Many users are experiencing the slow down due to the new RAM Management system in IOS 10.x which is not really the smartest thing to do. I recommend a downgrade to 9.3.5 (the last signed release before iOS 10) now! I just downgrade an iPhone 6 last night from 10.x to 9.3.5. Speed improvement was very much visible … right Keyur Parikh ?