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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Question marked as Top-ranking reply

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

Oct 28, 2017 6:27 PM in response to El Paso Steve

So now I have the issue of the App Store app being hinky. Often times it updates my apps, no problem. But every once in a while it is unresponsive, when opening the app it shows needed updates, but does nothing. And when the app is closed it doesn't show the number of apps to be updated. It then works if I hard restart it. Wi-fi on, off, data on, off, makes no difference. Latest advice from Apple Support on Twitter? Back up and Restore on iTunes. Call me skeptical but I think I'll wait before I do that.

Nov 5, 2017 6:56 PM in response to El Paso Steve

Hello everyone,

Welcome to this thread in the Apple Support Communities. A simple step is to "Reset All Settings" which is found in Settings > General > Reset > Reset All Settings.

Don't use this page to hint at Apple slowing down devices, if you have product feedback for Apple send it here (http://https://www.apple.com/feedback/)

For technical support, click here (http://support.apple.com)

Nov 6, 2017 2:53 PM in response to svaardt

I'm sure that was "painful" for both as it appears it was slightly involved.

However, you can call back with case # and politely ask to speak to a senior manager to see if they may be able to put in a ticket to a software engineer to roll you back safely and securely to the older version that worked. This may be an option. I would at least try as it appears you and the advisor tried all else.

Sluggishness with the iphone 6 and the 11.1 is a known issue, so I say give it a shot. Ya' never know - you might be able to push forward & resolve issue until they get the issue taken care of overall 😉

Nov 30, 2017 2:31 PM in response to IdrisSeabright

I kinda tend to agree with others, here.

Shouldn't L-ion batteries in iDevices last more than 2-3 years?

All of my iDevices still have their original batteries.

My 2010 1st gen iPad STILL is working on its original battery which is approaching 8 years old!

My iPad 2 and 3 models are still running on their original batteries which are nearly 6-7 years old!

I, also have a 2008 iPod Touch and the L-ion battery in THAT iDevices is still going! That is nearly a 10 year old device STILL working on its original battery!

So, what’s up with the batteries in newer iDevices?

I hope my Li-ion battery in my 2015 iPad Pro gets more than 2-3 years of life!

Dec 8, 2017 2:20 PM in response to liv0123

Inability to support VoWifi (Wifi Calling) is a common problem as the phones need to have the OS support baked in, AND certified by the carrier. VoLTE not so much, but still the same - the carrier need to certify it. In time, your high-end phone is likely going to be certified for it. Galaxy S9 doesn't seem to be on the list, eventhough iPhone X has appeared on this list http://www.spectrumgateway.com/compatible-phones#t-mobile


HOWEVER, having a high-end phone and not able to receive LTE, and thus without LTE, you cannot do VoLTE (and VoLTE is a prereq for VoWifi), is not right. If it is a US, and carrier bought phone, then you should get it returned and fixed. Unless of course you do not have a data plan, which then becomes a bigger problem trying to get your account fixed. LTE nowadays is 'basic' service, and it is just not right that you're not getting LTE on your phone, and subscribed to the big 4 (ATT, TMO, Vz, Sprint).

Dec 24, 2017 7:55 AM in response to gregnnats

Couldn't agree more. Called Apple yesterday after several freeze episodes. Got passed around for 45 minutes to 5 different people. Honestly, they were more concerned about finding system issues within Apple than fixing my phone issues. Never admitted that there is a growing outcry from dedicated Apple customers like me. This being my 3rd call they wanted me to invest 2-3 more hours by going to the Apple store for a more 'extensive' diagnostic - I refused and shamed them - they know what is happening. The engineers seem oblivious to this forum conversation and its now 40 pages (though it was 58 yesterday...hmmm.) This is either a testament to their acting abilities or their dysfunction. I hope its the former. There is a lot of information manipulation going on here to protect the Apple core it seems...

Dec 24, 2017 3:55 PM in response to Uboat CT

Apple advisors are not given any information unless it is valid and made public by Apple for release. They find out about the latest updates, etc when everyone else does to prevent miscommunication and for all practical purposes. They simply have a broader base of user feedback as that's what they work on each day and night. But, no - they are on equal ground for release of info by Apple

The software engineers don't visit this site. They get their feedback via the appropriate link and via techs through the appropriate channels.

The info here cannot be considered credible as anyone can state anything plus each case and device is truly unique, to put it very simply.

Anyhow. You all have a happy holiday season ☺

Dec 28, 2017 1:52 PM in response to El Paso Steve

For those suffering from poor or suboptimal performance after migrating their old device to iOS 11, it seems that the best practical solution is to have the battery replaced by a new one (this should be possible in an Apple Store). Then iOS 11 will notice that the battery is new and will not slowdown the processor. This is what I have read on multiple geek forums. Now the question is whether Apple will improve its communication towards custand also whether it will cover the cost of replacing the battery for devices which are more than 1 year old.

Jan 13, 2018 6:27 PM in response to Philly_Phan

I have had my battery changed, the CPU is back to normal speeds and the phone is finally usable.

But it is still noticeably slower than it was with ios 10: it cannot even handle typing smoothly as I am writing this, Siri takes forever to answer, fast forwarding podcasts sometimes rewinds instead or vice versa, the phone freezes for 10 seconds every time a youtube video ends, and the list goes on and on.

IOS 11 is an absolute disaster which should have never been released in the current state, or at least not for devices which cannot handle it properly.

I payed 1000€ for this device not 3 years ago, I will not be conviced that it not being able to handle normal use is normal.

My gf's galaxy s6 flies like the first day, my 6y old PC runs like a charm with the latest windows 10, and my 1000€ 3y old iphone (with a new battery) runs noticeably worse than my mom's 150€ xiaomi.

I pay extra to Apple PRECISELY to not have to go through this kind of cr*p...

No more, android it is.

Jan 14, 2018 9:43 AM in response to evergreens197

evergreens197 wrote:


You go to bed and turn off your phone at about 43% battery remaining, leaving it on the table.

Why aren't you plugging your phone in at night? If you plug your phone in at night, make sure it's connected to WiFi and the screen is locked, your phone will be backed up to iCloud (assuming you have that turned on) and will be charged and ready to go in the morning. Also, you won't need to risk damaging your phone by putting it under a heater.


The temperatures you're citing are within the operating range of the iPhone. Therefore, if you're phone isn't working at those temperatures, there's something wrong with it.


Environmental Requirements

  • Operating ambient temperature: 32° to 95° F (0° to 35° C)
  • Nonoperating temperature: ‑4° to 113° F (‑20° to 45° C)

Jan 28, 2018 7:53 AM in response to Lawrence Finch

It must be about choice that is the point.


If there are 2 laptops for sale and one says this laptop will reduce its performance when the battery gets low and the other didn’t, I know which one I’d buy!

Do you honestly think if this was advertised next to the phone that Apple would actually sell any? I think not, and if they are pushing this on owners who have already bought phones who did not have a choice, then yes, they must be given a choice to turn it off .

What other phone manufacturer do you know that implements this sneaky backdoor behaviour?

Jan 30, 2018 12:15 AM in response to Philly_Phan

I agree it makes sense. In one way. Until you need to connect:

- a projector (for presentations) HDMI or VGA

- an external drive (USB)

- a thumb drive (USB)

- an ethernet cable (Ethernet)

- a memory card from your phone


Are there solutions ? Yes of course: enter dongle-land. Apple will happily sell you a dongle that has one USB port, one HDMI port and ... one USB-C. Need VGA ? Easy. Just buy another dongle. Need ethernet ? Another dongle. Need all of them together ? Just string the dongles ... Gone are the days where I would quickly load up my iPhone just by sticking the USB cable to my Macbook. Now I need to first look into my bag of dongles, fish out the right one, stick everything in ...


I ended up buying a third-party bulky dongle that has Ethernet, two USB ports, HDMI ...


The thing I hate the most ? The commiseration of my Windows-laptop toting colleagues who need nothing of the above.

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iPhone 6 very slow with IOS 11 update

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