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

Apr 3, 2018 12:36 PM in response to agmillan86278

agmillan86278 wrote:


Sorry, but that is not true.

Yes, it's absolutely true. iOS 11 used dynamic throttling on older batteries. iOS 11.3 allows you to turn it off. That's all. If it's turned off, you won't see the performance hit but your battery may drain rapidly or shut off unexpectedly. The only way to resolve that is with a new battery.


If you think your phone got faster with iOS 11.3 and you haven't disabled the throttling, then, the difference is not in the phone or it's behavior but in your perception.

Apr 23, 2018 4:48 AM in response to El Paso Steve

1. I looked at the settings/privacy/analytics/analytics Data - there were a lot of program crashes and dumps on my phone. I ran a backup to Itunes and that removed them and seemed to help.

2. settings/location services/system services/ there are a lot of product improvements that are running on the phones. I turned off iphone analytics, popular near me, routing & traffic , significant Locations (this may impact some of your apps so test them after your turn these settings off) I didn't see any impact on the apps I use.

3. I went through my location sharing at settings/privacy/location services - and changed all the "background" refresh apps to "while using" or "never" to save on my cpu usage for apps that don't really need to update in the background when I'm not using them.

Oct 10, 2017 6:05 PM in response to Marc007@

Hello there,

Welcome to the Apple Support Communities! I know how important your iPhone is, so let's get your iPhone up and running.

I will suggest that you create an encrypted iTunes local backup, then restore your iPhone to iOS 11.0.2, which is the latest version of iOS. You can find instructions to get your iPhone 6 up and running again.

How to back up your iPhone, iPad, and iPod touch - Apple Support

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

✅ Note: iTunes will erase and restore your iPhone to iOS 11.0.2 and will verify the update with Apple, please ensure you have have an iOS 11 backup if you want to keep your data. To keep Health & Activity data with your Apple Watch, ensure the backup is encrypted.


- Vis 🙂

Support Communities

Oct 22, 2017 10:55 AM in response to MartinUnder

Each step failed until I reset to factory settings and restored from my iCloud backup.

As always a bit of a faff but it has worked and my iPhone 6 is back at speed with IOS 11.3.

I know IOS 11 is 64 bit only and I expected my original upgrade to ID any 32bit apps, it did not.

One app [a UK weather one] failed to load and I suspect that may have been some of the problem.


All smiles now 🙂😁😎

Nov 5, 2017 1:38 AM in response to Serolio

Thank you Serolio!! This worked for me! I’m still using my iPhone 6 Plus and after updating to iOS 11 my phone was terrible! Crazy slow, keyboard was super laggy and unresponsive, apps would take forever to open and battery life was embarrassing, it just felt like something was holding it back and causing the delay. I did a full restore, freed up a lot space, turned off background app refresh and reduced motion all with no luck. After resetting all the settings my phone was back! Keyboard is fast and responsive again, Apps open normally now and everything just feels normal again. Updating to iOS 11 must have caused something to linger and cause all this drain and delay and resetting the settings seems to remove that.


Whoever is still experiencing this please reset all the settings and see for yourself. Thanks again!!

Nov 10, 2017 8:57 AM in response to mo254

Hi Mo,

I understand...

There's definitely going to be stability issues & known issues resolved. Overall, improved performance is a big one, as always.

Much of what I know about improvement via the 11.2 update is related to the iPhone X; however, they always consider feedback across the board to help resolve an array of issues for all devices & have done just that.

This includes performance naturally & as mentioned above as well as bug fixes.

I noticed you mentioned an issue with your apps for example - it appears this is one area of many they've worked on with this update as well.

I'd definitely give it another shot.

Really hoping this works for you!

Nov 13, 2017 2:54 AM in response to gavinquail

Mine was the same.. Finally, I decided to try the Reset All Settings trick and it did actually work. It's a little annoying having to set all the settings again now, but the phone is definitely MUCH faster than before so I guess it's worth it. Still annoying we had to go through this in the first place though. It's all part of their planned obsolescence probably >_<

Nov 20, 2017 12:03 PM in response to orion77

Also,


Have any of you tried a hard reset of your iPhone 6/6S by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons


In Settings app, General settings panel, turn OFF Background App Refresh.

In Settings app, under General settings, Reset panel, at the right bottom of the list, Reset All Settings.

In Settings app (NOT from the iOS Control Panel) turn OFF Bluetooth when not using any Bluetooth devices.

iOS has a issue/bug with just simply turning on/off Bluetooth and WiFi using the iOS Control Panel


Also, in general, if you want a faster IDevice, on all of my iDevices, I turn off most of the iOS motion graphics eye candy, by simply turning ON Reduce Motion in Settings app, General, Accessibilty settings.


If none of this, so far, has helped your iPhone 6,/6S,


What about doing a complete backup to iCloud or iTunes on a computer, then do a complete erase and reset as new in the Settings app under General, Reset then restore your backup from iCloud or iTunes?

Nov 20, 2017 1:04 PM in response to liv0123

MichelPM: Thanks for posting the detailed suggestions. My apologies to Lawrence. Update: I own an iPhone 6 Plus, 64GB with over 25GB free. I followed the same instructions above, which were provided by Apple Support tech during a service call. I performed a complete Erase all setting and content, restored the phone to native settings, and used the phone for several hours. The phone appeared to work nearly as well as when it was new, free of 3rd party apps, no addtional email accounts, Bluetooth turned off, and Background App Refresh disabled. Then I performed a backup from iCloud. The phone began performing poorly within a few hours of the restore. Disheartened, I threatened to throw the phone away. My wife owns an iPhone 6 128Gb and just recently updated to 11.2 without any noticeable issue. I drew a long, deep breath and began uninstalling 3rd party apps. After removing thirty some apps and the Xfinity WiFi Hotspot app (big suspect), I performed a reset. Since then, my phone is behaving fairly well, with only a slight, but tolerable lag - a little delay in opening mail and iMessaging. I'm sure I left out a few details, but I wanted to share this experience, to offer some hope for those who want their phones to work, and who don't want to resort to extreme measures. I can assume that at least one, and quite likely more apps are not optimized to utilize the OS upgrades, and will cause issues. If I discover any specific app that causes issues, I'll post here. In the meantime, I'll begin planning and budgeting for an iPhone upgrade. I wish my phone would last several more years, but that isn't the paradigm in which I live; unless I want to go back to the glorious flip-phone! I appreciate all the comments and postings related to this thread. One last comment: I wish Apple chose to deliver an optional upgrade without requiring everyone to accept the upgrade path. Good luck, all.

Nov 30, 2017 1:30 PM in response to Zarbon2005

Zarbon2005 wrote:



Suffice to say, the conversation was ended before I could ask any further questions or get any further support.

They ran a remote diagnostic and it was determined that your battery needs to be replaced. You were repeatedly asked if you wanted them to help you set up an appointment to have the phone looked at. They can't fix hardware over the phone.

Nov 30, 2017 1:40 PM in response to Zarbon2005

You'd be amazed at what a battery replacement will do.

After a sw update, backup,and other particular changes, it's normal for the battery to act out of sorts for a while.

However, it appears your battery was to a point already in which it needed to be repaired.

It's a good thing he ran diagnostics for you; now you may find resolution

Many users are on here with all models noting system-wide issues, and a new battery has been the primary cause. Replacing theirs has helped them and many others

Best of luck

Dec 17, 2017 7:45 AM in response to tarun5225

It's been two weeks since I replaced the battery in my 6 plus, 64GB iPhone and wanted to provide an update. Performance has remained significantly better since the replacement; however, there are definite correlations between performance and battery state. When the charge is below 50%, there are very noticeable performance hits, especially with scrolling down pages and lists; iMessager is slow to respond, the native email app is degraded, and screen orientation definitely takes a hit. I rely on this phone for business and there are times when I want to toss it out the window when I'm stuck waiting for a process to complete before the app returns. As I posted in previous threads above, I have restored this device to a native state and re-installed just the essential apps from the iTunes store. I have over 40GB free storage, and I've disabled most, if not all the "fancy" features. So, in conclusion: a fresh battery will definitely improve the overall performance and make the phone generally usable, don't expect that to restore it to it's previous Apple glory.

Dec 18, 2017 10:17 AM in response to El Paso Steve

For all those wondering if a new battery will solve the problem, Geekbench just posted a blog on this very issue:


https://www.geekbench.com/blog/2017/12/iphone-performance-and-battery-age/


I've already confirmed this issue on my (basically useless once I get lower than 90% battery) iPhone 6. At this point, it's pretty obvious what's going on here...

<Edited by Host>


Note, this post was edited by Apple.

Dec 20, 2017 1:04 PM in response to kristin.

Just had a new battery put in my iPhone 6 and it's like a new phone again. I can now open Messages and start typing immediately—no more waiting 15+ seconds for the keyboard to appear and have the first few letters I type missed. And I can open the camera and immediately start shooting—no more waiting 10-15 seconds to be able to take a photo.


Just glad I didn't upgrade my phone, thinking it was because my iPhone 6 was "old".

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iPhone 6 very slow with IOS 11 update

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