Thought I'd clear up a common misconception, with Apples business model, people are wondering why the oldest supported devices on iOS 11 are really slow, aside from it being BETA 1 They believe Apple is simply screwing them and making them upgrade. They say how their 8 year old pc got a Windows update and it actually made it faster (I somehow doubt that) 1. Apple execs don't sit in a office all day scheming to rip off people and force "planned obsolescence" 2. The reason older devices don't perform quite as quick as the newer ones is simply because Apple has vastly advanced the target hardware and processing power in the iPhones and iPads since 2013. The newer versions of iOS logically are designed with that hardware in mind so it makes since the old ones would be slower. As for iOS 11 performance, the jury is stil out considering its not even beta 2 let alone 11.3.456 3. The only reason Windows updates support the older hardware and still run decent is because your basic intel CPU hadn't evolved much in the past 8 years. Yah they made some improvements but its not nearly the same magnitude that Apples made in the last 4 years. 4. Let's not forget Windows 10 is essentially Windows 7 with improved security and a fresh coat of paint, while iOS 9,10,11 all have brought new innovative fundamental changes to the core of the OS from security, graphics, and even the entire file system. All of which were designed with the newer devices technology and performance in mind. TLDR: Apple isn't trying to screw you, they are simply giving us features we asked for and well sorry but new flash the A7 may be 64 bit but it still is very primitive architecture wise compared to A9 or newer chips from Apple. So yah the iPad Air and iPhone 5s probably wont perform the best but I bet they will be perfectly functional aside from loading things a little slow. Which really is impressive considering the difference between iOS 11 vs iOS 7 in terms of the overhead of each operating system.