Application-wide?
Try setting the speed property on the backing layer for your view controllers' content views. speed=2 would be double-speed. You could probably set this in the viewDidLoad method for all your view controllers.
You might also be able to create a custom subclass of UIWindow, and have that window object set the speed property on it's view layer to 2.0 in a bottleneck method like makeKeyWindow. You'd need to make all your app's UIWindow objects use your custom class. I'd have to do some digging to figure out how to do that.
##Edit:
Or, better idea, set self.window.layer.speed = 2.0
in your app delegate after creating the window, as suggested by @Costique in the comment below.
Note that this approach will speed up ALL animations, not just transitions and segues. If you only want to speed up segues you would have to figure out how to target just those animations. I'd have to think about that.
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