iOS 11 incredibly slow on iPhone 7 Plus

No new screen on mine - the phone is only a couple of months old! Gave up and went back to 10.3.3

I'd also recommend anyone making an instant judgement about speed wait several hours first.

To make sure functionality is restored as soon as possible after an install, a lot of database updating occurs behind the scenes when the device comes back up that may take a few hours to complete. Those of you with Macs may be familiar with the fact that after you install a new version of macOS, the Spotlight indices must be rebuilt; it's no different in iOS.

While that is going on, performance suffers and battery charge may drop significantly, which is why it's best to always be plugged into a power source when updating.

So, I just talked to a technical advisor from Apple Support and he made me run some tests and diagnostics. First diagnostic didn't reveal any failure or hardware issues, all checked out fine.

The second diagnostic created 100 MB of log files and data, that got transfered to Apple Support and their engineers will look at them.

The support guys told me that they have had some reports of strange behaviour with iOS 11.

So please, if you haven't called Apple Support yet, then do it! Upgrade to iOS 11, call from a different phone and make them run the tests and get the log files etc. Only way to solve this, I guess.

use itunes. restore with option key. assuming you have iPhone_7Plus_10.3.3_14G60_Restore.ipsw select that and off you go. over simplified. the ipsw i have is from reddit

I'm in the same boat with an iPhone 7 Plus 128Gb in the UK having carried out every conceivable permutation of reinstall and update to iOS 11.0.0 and 11.0.1 with backups from various iTunes saves as well as iCloud from a complete wipe.

For comparative purposes, mine takes 4.5 minutes to boot up from off and then begins to freeze after two swipes after unlocking. It also has no haptics, vibrate, sound or Siri. I can also neither make nor receive calls.

I've probably spent 8 hours on the phone with a very knowledgeable Apple Customer Service rep and sent two lots of logs via my iMac but all to no avail after almost a week. She said downgrading to iOS wasn't supported by Apple so it sounds as if there's conflicting advice being given about this.

Reading around the forums, the issue isn't restricted to iPhone 7's but there does seem to be a correlation with some, but not all, third party screen replacements. In some case exactly the same issues have been reported with phones that have never been damaged (see above).

One other factor that has been mentioned in a number of cases is how hot the phone got during the reinstall/upgrade. Mine was still bearable to handle but got very warm front and back and wonder whether the update caused a component failure due to heat? However, this seems unlikely if rolling back to iOS10 removes the fault.

Clearly there's an issue affecting a small percentage of users in a variety of countries but there seems to be no common connection, other than the screen issue but only in some cases.

If I don't get a resolution in the next 24 hours I'm going to drive to my nearest Apple Store and try for an over the counter warranty replacement.

Has anyone else anything new to add/suggest?

(29 September 14.30 BST)

Which symptoms did you have before?

Similar to these:

- No Sound

- No working microphone (people not able to hear you through the phone)

- No vibration

- Very slow respons when opening apps etc

I talked with Apple Support today and they said that engineers were working on the issue, but they didn't have an answer to when it would be solved - 5 hours later iOS11.0.3 was released! If this is the fix then I'd be very happy!

I have the iPhone 7+. The only problem I was having with the iOS 11 and 11.0.2 upgrade is my phone was brought to a snails pace. It would take as long as 5 minutes+ to open a link in an email, or to surf the Internet. After I posted in several threads here, my phone improved on its own accord. I did restart it several times in the interim. Several days went by before my iPhone’s speed improved, about 5+\-. By the time I downloaded 11.3.0 early yesterday afternoon, my phone was back to normal. I have not yet had any significant problems with the recent download. My iPhone’s speed has slowed once or twice, and it gradually improved after I restarted the phone. Thank you Apple for addressing this issue, as my iPhone was essentially useless for a few days.

Holy crap - I just read the list of items 11.0.3 addresses and it sounds like it was specifically targeted to fix the issues described here. No sound, haptic, unresponsive touch, etc. Thanks, Apple!

To be honest I was actually on the iOS 11 Beta program and had to roll my phone back then because it caused me the exact same issues as we are all seeing now, I was told at the time "wait for a new update and it will fix it"... well that update never came and for some reason I naively thought I wouldn't see the same problem with the official release.

I do agree with you, I can find nothing on the internet about this and have no clue why such an apparently small amount of users are experiencing this, at least in my experience it has happened at different times and completely different OS builds... it appears that my phone just cannot use iOS 11. (Its a 7 plus by the way so I am assuming its not a hardware issue).

Oh yeah don't fall for the re-indexing, my phone was practically bricked for a week because apple told me to wait...

Anyway, I hope your phone carries on working on 10.3.3, if its any small comfort I had no problems whatsoever when I rolled back from the beta.

Expect an update tonight or possibly tomorrow morning regarding my conversation with apple!

I'll add to the list of issues, just tried to play music (from apple music) and got "this operation could not be completed" with "an unknown error occurred (-12746)".

Helpful tip for anyone still having this issue like myself - Instead of tapping each icon and waiting, I've been double tapping the home button and sliding between apps, there's no lag doing that.

Bill YOU need to contact apple. Send them your s/n and an iPhone data dump. somehow there is something right about your phone we should all know. Seriously you might be literally holding the answer. lol apple can use your iPhone blood to make the antidote for the rest of unlucky owners.😀

Hello Anigoreg,

I don't think anybody here has had this issue resolved without reverting to 10.3.3.

If you are looking for a fast solution this may be the only option, apple are however looking at my case at the moment and should be getting back to me soon, I will be updating this thread with any updates.

Till then good luck, and if its any help double tap the home button and use that app switching technique to get around the lag, outside of that I don't know anything else

Philly_Phan wrote:

Mine runs like a rabbit.

What were you told when you took your phone to an Apple Store for evaluation and resolution?

Mine lagged for the first hour or so after I finished the update. It appeared to be downloading and updating a lot of stuff in the background. Since then it's been perfect.