I was wondering if I'm alone in a world of 100 million iPhone users that find this quite annoying... on iOS9 it seems to impose a 1 second delay or so every time I switch from a screen to the home screen and try to tap an icon. The icon will not respond to input for that 1 second or so. So I usually tap 2-3 times before it responds. iOS 8.4.1 didn't have this issue, it let me tap on icons immediately. Please note this is more noticeable when using reduce motion on, which gives you a faster fade in/out transition effect rather than the default zooming. My typical usage and why I find it annoying is because when multitasking, ie you switch apps and go to home screen to tap another, I usually end up tapping 2-3 times the same icon, because it won't respond the first time. iOS 8.4.1 was beautiful in this regard, it always responded on first tap. I have confirmed this behavior on the newest hardware 6s, on both mine and the 6s at the Apple stores as well as iPads, so I'm 100% this is new behavior on iOS9 and not a bottleneck on hardware, it just seems coded to have this delay. Also note that this doesn't seem to be a hardware issue, my 5s responds immediately to taps on 8.4.1, while the 6s delays a second or so under iOS9 before it lets input reach the icon. Thoughts? Edit: the user Act3 posted these videos which show exactly what I'm referring to (thanks!): Update Jan 13, 2016: Thanks to user comments here and my own observations I was able to compile a list of cases where input is blocked/allowed during animations. I think this is useful in identifying, these are cases where workflow is disrupted and the user may have to tap 2 or 3 times to continue interaction with device. These all pertain to iOS 9.0-9.2: #Input-Blocking animations (bad!): Zooming/fade-in-out to home screen animation (blocks tapping on apps, 3d touch and sliding screens) (this input blocking was added in iOS9, it wasn't present in iOS 8.4.1) 3D-touch, lock screen to home screen animation (for example, user tries unlocking iPhone and immediately 3d-touching on Phone to call one of his favorite contacts, but iOS blocks input resulting in user having to re-do the 3D touch action) Editing animation for example when you tap on edit in Mail app or Clock app and immediately try to edit an item (this input blocking was added in iOS9, it wasn't present in iOS 8.4.1): Scrolling animation + input field iOS9.2 vs iOS5.1.1 (thank you @perfect_ for this link) Rubber-banding scrolling animation (blocks tapping, 3d touch) when you scroll to the end of a list, and quickly tap the last item in the list, your input won't register until the rubber-band animation stops animating. Notification/Widget panel sliding animation - for example with widgets (I have philips hue buttons in notifications panel), one has to double or triple tap in order to register, because usually the first tap won't register due to input-blocking. iOS9 folders animation (only tapping outside) (blocks tapping, 3d touch) Back/Forward animation (blocks tapping, 3d touch) - example, Mail, tap inbox and tap first message fast, it won't register. From lock screen to home screen animation: no 3d touch allowed (very important use case, whenever you take your phone out and unlock it, the transition to home screen does allow tap input during animation, which is good, but it doesn't allow 3d touch = bad) #Input-Allowed animations (good!): Control Center (stuff like flashlight, camera are immediately available, no input blocking, good!) iOS9 folders animation (only when closing a folder and immediately trying to open another) Tapping home button when you are on a home screen other than page 1 - for example if you are in page 5 of your home screens, it brings you back to home screen page 1, but you can interrupt it and it will allow input during animation. From lock screen to home screen animation: tap allowed, but not 3d touch(very important use case, whenever you take your phone out and unlock it, the transition to home screen does allow input during animation, which is good, but it doesn't allow 3d touch = bad) Zooming/fade-in-out to home screen animation: when invoked via pinch gesture only confirmed in 9.3 b2 (thanks Act3 and Jayson A), if you use pinch gesture to go to the home screen rather than home button and immediately try to tap an icon your input isn't blocked.