iPhone 6 very slow with IOS 11 update

After receiving IOS 11.01.1 on my MGCT2LL/A1522 (iPhone 6), my phone is super slow. Apps hang, then close (like the Starbucks app), my purchased music would just stop in the middle of a song, then I had to close the app and re-open.

In general, everything is very slow to respond, and I have rebooted twice.


Any suggestions

Posted on Oct 1, 2017 5:02 PM

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Posted on Oct 11, 2017 9:03 AM

HERE'S THE FIX: Go into Settings> General> Reset> Reset All Settings (this will reset iOS settings, won't touch your apps)


WHAT THIS DOES: This will *not* erase your phone, but will reset most of the things you can adjust in settings on iOS (you'll need to re-enter you wifi, adjust notifications and privacy settings again, reset your default account for Calendar and Notes, etc, but all your email accounts and iCloud account will still be logged in and all working).


FIXES THIS ISSUE: I had the same issue: iPhone 6S. Upgraded. Even with 25GB free, I'd press a button and often have to wait 1-3 seconds for a response, or copy and paste selectors would be really slow to appear, even the keyboard was unresponsive... phone was barely unusable, literally. I think most people don't get it because most who updated to iOS 11 noticed it being a little slower but not 90% slower. Those like us need to take this step.


BACKGROUND: When I was scouring I found that erasing your phone and restoring from backup worked for people on Reddit, and that should be reliable. I was in the process of doing that myself and accidentally chose "reset all settings" instead of "erase all content and settings". My phone rebooted and all my apps are fine, just needed to go through iOS settings and readjust things.


ALTERNATIVES: This is obviously better than either (a) downgrading to iOS 10 or (b) making sure your phone (as it is now on iOS11) is backed up to iCloud, erasing it, and restoring from that backup.


The difference in speed is shocking.


Pretty sure this will work for you too.

733 replies

Jan 14, 2018 8:01 AM in response to svaardt

I too was seeing in the battery usage info that my 'No Mobile Coverage' was the highest battery drain at 53% over a few days. I have no mobile coverage at home, so use the WiFi calling option, However, as the phone boosts power to try and get a cellular signal (which it won't if you are in a no coverage area of course) - it can cause a battery drain quite rapidly.


In these situations, at home, you have to put it into Airplane mode, which turns off the cellular and then re-enable WiFi so stop this happening. Don't for get to switch off airplane mode when you go out again!

Jan 29, 2018 4:44 AM in response to Lawrence Finch

It's still about choice and laptops don't do that - the iphone 6 does!


Let's get real - we know that mechanical hard drives fail - it is a risk, that's why we take backups of our critical data. But with power on laptops the user can manage power features from CPU usage to suspending USB ports and just about every other battery saving feature - we have choice and almost infinite reconfigurability of the power saving features. We have no say currently on the performance-throttling situation with the iPhone.


Now, had Apple instead opted to say something like the following, do you really think we'd be having law suits, class action and thousands of complaints if they had been upfront and honest to start with?


"Hey everybody, we'd like to share something truly remarkable with you today.... (😎) We'd like to tell you that our incredibly designed iPhone hardware and software has a bug, flaw, design fault new feature. When your battery starts to get old, is not fully charged, or cannot hold a full charge any more, it may cause your phone to malfunction or crash. However, this new feature we are introducing will automatically reduce CPU / GPU performance of the phone to prevent this happening. We appreciate this is not what you want to hear and realise that your phone will start slowing down, the keyboard response will lag, apps will crash or stop working - but hey! we are giving you the choice to enable or disable this feature - so you are always in charge - and remember, we care....🙂"


Ok, maybe not so sarcastic as that, but what I bitterly dislike about this entire fiasco is that I spent months and months with these problems, with a phone that was effectively non-operational, wasting my time, troubleshooting, listening to crackpot BS theories, solutions and the 'Apple can do no wrong' worshippers blaming users on their usage habits, with no acknowledgement - nothing but silence from the people in the big apple that knew about this and did nothing to explain the deliberate throttling until just recently, culminating in an almost unheard of apology.😮


So now, lets wait for the 'fix'. If people will be given the choice to disable the feature if desired - great - if they don't like it they can always vote with their wallets and that will be their choice too. The condescending 'we know what's best for the plebs' attitude will always backfire in the end.

Jan 30, 2018 1:18 AM in response to Forgotten Rebel

My iPhone6 worked perfectly fine - up until the iOS 11 upgrade. Only now, after the upgrade, do I have a "slow almost inoperable iPhone".


So, yes, I am looking forward to a iOS 11 fix that lets me diable Apple's throttling down of my iPhone CPU so it becomes usable again.


To be clear, I have never had the sudden crashes.


I am also going to take advantage of the cheap battery replacement offer. Why would I not ?

Oct 7, 2017 7:57 AM in response to Exmor

I have two iPhone 6's. I've upgraded one to 11.02 and left the other at 10.3.3. The upgrade was uneventful, however, what is very obvious to me is a very annoying slight delay in just about all functionality. I've tested this methodically against my 10.3.3 handset and there is a noticable 'sluggishness' in activating simple things like text messages, replying to texts, opening email, writing an email etc, etc. Basically any functionality on the 11.02 phone is now approx 0.25-0.5sec slower than before which may not sound a lot, but when you are used to a very snappy 10.3.3 phone and are able to zip around it and the phone be able to keep up, moving to 11.0.2 feels like my feet are in concrete. Let me clear - I'm not talking about the issues some people are experiencing with app crashing, very slow applications, very slow home button etc, I'm talking about general use of the device now being overall more sluggish than its predecessor.


I want to flash back to 10.3.3 but there doesnt appear to be any way to do it now. I am annoyed beyond belief and feel completely frustrated each time I pick up my phone to use it because its simply not as responsive as it was before. I know there is a lot of new tech in the upgrade, but I would trade it all for the snappy and responsive interface I've enjoyed for the past 3 years. I don't agree that there should be the need to compromise on interface speed just because there's a new OS, and I certainly cant afford to upgrade a perfectly working phone to a later model just because of an OS upgrade that I don't seem to be able to revert.


If anyone can tell me how I can go back to 10.3.3, please let me know. Thanks.

Jan 18, 2018 7:47 AM in response to El Paso Steve

Good news. Tim Cook says that a future version of iOS will let users control this feature and turn it off if they don't want it.

We will tell someone we're reducing your performance by some amount in order to not have an unexpected restart. And if you don't want it, you can turn it off.

It seems that they will roll this out in a developer beta next month, so it will take some time to get to users. But it's very good news, and what they should have done from the start.


The full story is here: https://www.macrumors.com/2018/01/17/tim-cook-on-iphone-battery-controversy/

Jan 28, 2018 1:34 AM in response to MichelPM

You forgot to mention that Tim Cook also promised an option in the upcoming IOS 11.3 for owners to DISABLE this CPU performance crippling feature!


He is giving the owners a choice to use it or not, something we currently have no control over.


And let us also not forget that this performance throttling ‘feature’ will NOT be limited to iPhone 6 models, but will be applied to ALL iPhones in future.

Feb 11, 2018 3:24 PM in response to El Paso Steve

I was going to schedule an appointment with someone at the Genius bar, but was only given an option to call Apple direct. I did so and received immediate help from a Senior Tech. He helped me update to 11.2.5 and also installed a diagnostic app. I was extremely impressed with the helpfulness and his dedication to making sure my issue was resolved. The tech helped me better understand how my phone uses battery power and he called me back 2 days in a row to make sure I didn't have any new issues!

This experience totally convinced me to remain a faithful Apple fan.

Kudos to Ronald at Apple!

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iPhone 6 very slow with IOS 11 update

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