They tested the performance of the hardware (CPU, GPU, etc), not of the APIs or updated apps. So the CPU and GPU of my iPhone 6 are just as fast as when they

They tested the performance of the hardware (CPU, GPU, etc), not of the APIs or updated apps. So the CPU and GPU of my iPhone 6 are just as fast as when they were released. But I can guarantee you that the camera app as well as a lot of third party apps aren't as fast as they were when I bought the phone.