Oh that's very nice. In iOS 7 we had a jailbreak tweak called NoSlowAnimations[0]. It was amazing how much a simple thing increased the perceived speed and responsiveness of the OS.
Don't have an iphone handy but I think so. There are lots of options there to explore, there's also one to increase contrast and another to make buttons more evident. There's some cool stuff there in accessibility options
You can disable it for all windows in all applications using a terminal command:
You might need to restart apps to see this change.