A 25% increase in CPU and 50% increase in GPU seems like a barely significant increase. The A4 to A5 gave twice the CPU and 9X the GPU. Ever since then, chip performance has been doubled with each new chip except the A8. Is the iPhone 6 (and to a greater extent the iPhone 6 Plus) the "iPad 3" of our generation? A CPU/GPU with 1GB RAM that is barely powerful enough to run the 6 Plus 1080p screen? Because it is underpowered to begin with, I don't think the 6 and 6 Plus will run iOS 10 smoothly when normally iPhones can run the next two iOS updates without a huge degradation in performance.