The majority of my problems are on iPad only pretty much, not saying iPhone is perfect, but it is much. Much. Less laggy and glitchy than iPad, if you are talking about an A6 or higher iPhone. (5, 5C, 5S, 6, not sure about 6+, I've heard it has lag problems but I have never used one or looked into its lag issues)
And the reason you don't hear many specifics is because there are so many instances where the UI lags that it's almost impossible what to choose to describe it to people xD
Anyway. If you really want me to get specific. This next part will all apply to UI Stutteriness on my mini 2. Even since iOS 7.1.2, the notification and control center stutter on the lock screen. Also, the blurring involved when Siri is activated lags, especially when you are in apps. Dragging down for spotlight is stuttery. Rotating when spotlight is already open is extremely stuttery. Control center or notification center+spotlight, lots of lag. When you are making a new tab in the new tab view or occasionally when switching in and out of the tab view, there's choppiness. When you tap the URL bar in safari, there's lag. There is INSANE lag when you activate Siri, open notification center or control center at this point. When the app window is getting smaller and when the icons are entering the screen after closing an app with the multitasking gesture, there's lag. (It seems that this depends on how intense of an app you are closing, however) There's moderate lag when the blurred "Slide to Power Off" screen comes up. There's stutters here and there in the app switcher. When sending messages, the animation where the message moves up from the editing field into the conversation and gains it's respective color (green or blue depending on if you are using SMS or iMessage), there's lag. If the control center or Notification Center or Siri ever have to do with the keyboard or especially a split keyboard, there's lots of lag. Rotating AT ALL when the keyboard is open, lag. Dragging down for quick reply is a little choppy. Bringing up a window to compose a message from any share sheet (for example, trying to share a safari webpage with the share button) there's pretty big lag when the compose message screen comes up. Rotating literally ANYWHERE in the App Store carries immense amounts of lag, but it varies depending on what you're actually looking at in the app store. (I heard from 1 random source that the App Store lag was fixed on iPad in iOS 8 beta 5 but it returned for the GM)
I don't think any of those UI stutters occur on my iPhone 6, or the 5S I presume. I do see some stutters on the iPhone 5 in these spots now, but it is still better than my iPad mini 2 which is *newer* and more powerful than the iPhone 5. It's just gimped by having a much higher resolution display and a buggier version of iOS to deal with.
Oh and also, a couple annoying general bugs right off the top of my head that I can think of - When you try to copy/cut/paste/select text, the field that appears after a long press disappears almost instantly. This doesn't happen all the time, but it happens just enough to where it is seriously annoying. The bug from iOS 7.0.x in the app switcher is back, like when you would slide up to close and app but it would not really close the app, the preview of the app would just be gone with a lingering app icon below. Deleting anything by sliding left to reveal the delete button-Clicking the button sometimes causes the entry to just jarringly disappear immediately rather than slide up out of view. Going in and out of the list view in the weather app causes tremendous lag on any iPhone. Did not exist with iOS 7. When reduce transparency is turned on on iPads, there are no indicators that you tapped a key for the keyboard except for the space bar, backspace, return buttons etc. Scrolling the app previews and app icons in the app switcher opposite directions (if you time it right) can majorly screw the app switcher up, has existed since 7.0 I believe.) Closing an app in the app switcher and then quickly scrolling with the icons can cause the icons to be under the incorrect app preview. Sliding up on the lock screen for handoff- if you hit cancel by the passcode entry, it instantly jumps back to the lock screen rather than sliding back to the lockscreen with a graceful bounce. Not sure if that's a bug but it certainly seems odd. Clearing the notifications of a certain app causes the other notifications to fill in the now empty space very oddly, glitching and jumping, etc. Scrolling up and down the default wallpapers stutters on every iOS 7.0 and higher device (haven't tried the Air 2 but I'm sure it's the same) Also, all iOS 8 devices skip 60%, they go from 61% straight to 59%. Finally, on my iPhone 6, rotating from portrait to landscape (or vice versa) when in the tab view, major UI glitches have occurred. I can't even explain it, it's very random on what it does and when it wants to screw up. It may have even been fixed since I haven't tried this for awhile but yeah. This is an iPhone 6 or 6+ bug only, they have the iPad style tab view in landscape where the older iPhones have the same scrolling list view in landscape and portrait.
Edit- just tried the rotating of the tab view on my iPhone 6 and rotating from portrait to landscape and back makes the bottom bar where you can change to private browsing, make a new tab, or exit the tab view is gone when you return to portrait.
Yes, I know I was getting very nitpicky, but a bug is a bug. And you asked for specific, so I gave you specific haha.
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