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Personally, I found that iOS11 made my iPhone 6 noticeably slower. Here are a couple of examples.

1. Doing a screen shot takes at least 1/4 second to hear the "shutter" sound (sometimes up to 2 seconds). Used to be instaneous. The actual photo gets captured immediately, but the UI lag is disconcerting.

2. Apps that used to load instantly now take a few seconds to fully load. Just loading the stock calculator app has lag time before the numbers on the buttons show up.

3. General UI animations aren't nearly as smooth as iOS10. Swiping up/down doesn't quite track my finger the way it used to.

I will say that I just restored yesterday and it seems a little snappier. Can't say if the clean restore did it, or the update to 11.0.3. There's still a persistent lagginess, but not as bad as last week (on 11.0.0)

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Reading these threads makes me so glad I was able to upgrade back to 10.3.3 while I could on my 7+!!
 
Like many, I have an iPhone 6 that has turned to complete trash since updating to iOS 11. This is so unbearably slow... loading camera takes like 30 seconds, everything is unresponsive, apps no longer working, reduced battery, etc. Hands down the most disappointed I’ve ever been in apple.

Is there any way to go back or has that ship sailed? I’m ready to throw this phone out the window and switch to Android, which I loathe and makes me feel sick saying, lol.

We have iPhone 7 Plus, 6S Plus and iPad 10.5" in our house. Apart from Apple's forced 1sec delay for Home Button to close app, I am not having any show stopping issues with iOS 11.2 Beta 1.

I will give an example of iPhone 6. My bro uses iPhone 6 and it has been updated from iOS 8 till iOS 11 using inbuilt update service. It was never reset/DFU restored or set up as new in last 3 years. So now on iOS 11.0.3, it took 4-5 seconds to open up any app. There was a mandatory white screen for 4-5 seconds. So finally today we reset the phone and set it up as new. The Result: The phone feels relatively snappy and app opening time has reduced to 2-3 seconds.

Don't believe some people here who will tell you that iPhone 6 works perfectly well on iOS 11. It simply doesn't and Apple has stopped optimizing iOS for it. This is because iPhone 6/iPhone 6 Plus/iPad Air 1 was one of the worst hardware released by Apple. It was piss poor back then and there is no escaping it even today on iOS 11.

But 6S and above should not have any slowdown issues with iOS 11 as far as I believe. But 6S would behave silly on next year's iOS 12.
Your best bet would be to move over to iPhone 7/8 which have 2 GB RAM minimum.
 
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Those would be the things that have gotten addressed in iOS 11 while they (or at least some subset of them) still exist in iOS 10 and earlier versions (and won't be getting fixed there).

Just like when iOS 12 rolls out, certain ‘bugs’ remaining in iOS 11 will be ignored .. That was my point to the poster I quoted..

I’d love to slap iOS 11 on my iPhone, once (and if) it’s optimized for the device!
 
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