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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 3, 2017 9:22 PM

Many apps unresponsive. Phone also running extremely warm and battery draining very quickly. Turning off background app refresh makes no difference whatsoever. Hard reset has no effect. I have 78GB free.

733 replies

Jan 25, 2018 5:17 PM in response to Philly_Phan

About 7 days after getting my galaxy 8 plus, I randomly had no signal nor service; wouldn't even search for a signal. Then, I found out VoLTE I specifically inquired about and was assured I would get was not compatible with the 8 plus (it is compatible with two of the older models, as clarified by a senior tech. Phew! What a relief to find out after the fact and by chance, that I'd been given incorrect information and moreover, two OTHER models have this capability. Super news! Still ecstatic about it), but I totally agree, Phil. They are perfect....they mirror many, common issues my iPhone encounters and more, that ironically, I somehow manage to get resolved by sheer luck and zero effort, along with chronic complaining and blaming, bc those are the most effective ways to troubleshoot an issue I've noticed. But again, I stand by my statement that there is not one thing wrong with Samsung devices. They are 100% perfect like every device.

Everyone, just buy a Samsung. Ideal solution based on personal experience. Then, when you get upset with your Samsung device, go back and buy an iPhone. Keep repeating the same pattern, I say. Solution solved :)

Jan 28, 2018 1:16 AM in response to agmillan86278

Yes, it will!

If you have an iPhone 6/6S/6S plus that is close to two years old, replacing the battery WILL restore your iPhone to normal operations!!!

Apple has “officially” admitted that is was purposely slowing down the CPUs in ONLY all iPhone 6 and iPhone 6 variant models to preserve the continuous working of these iPhones that had older, aging degrading battery performance issues, by the time of the introduction of iOS 11!

Apple has admitted this and HAS implemented in the U.S. (soon to be introduced in other countries) a reduced priced battery replacement plan for ALL iPhone 6 AND later iPhone models!

The iPhone battery will only cost $29 U.S.D. ( the normal iPhone battery replacement cost is $79 U.S.D., a savings of $50 U.S.D.) and WILL return ANY iPhone 6 or iPhone 6 variant back to its former, normal operations and performance speed!


This reduced priced iPhone battery replacement program will stay in effect until December 2018!


Stop treating me like some sort of village idiot!


If you have a two year old iPhone, get the battery replaced as soon as you can!

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.

Jan 28, 2018 2:27 AM in response to bladedh

I don't 100 % agree with that - you can't make that assumption yet, as the software fix to allow you to turn that CPU / GPU throttling feature off is not available yet, even in IOS 11.3 public b**a testing at this time - so until it is, nobody can say this won't have an effect!


There are plenty of IOS 11 issues I do not like - keyboard response it still very poor, Landscape mode in Safari is more or less unusable, Safari is not rendering web pages properly, Siri has gone back to Nursery School, so does not understand half the things you say, with constant repetitions - that is far worse than IOS 10 - I agree there - but how much of this is down to throttling or just bad software I cannot say until we have the battery fix for a proper comparison.

Jan 28, 2018 2:51 AM in response to MichelPM

Michel - that has to be a choice for the end user though, surely, and not arbitrarily forced onto users, effectively degrading their hardware. That is not what the specifications said at new when purchased and not what users paid for when they bought their phones.


This is what is grating at people - an off the cuff announcement from Apple that probably 99.9% of users who don't follow every apple announcement are likely to of missed and who have been experiencing unacceptably poor performance issues and are only now finally finding out the probable culprit.


If my laptop is being used on battery power, I can choose to allow the power management to reduce the CPU and other hardware performance and use it longer, or I can disable power management features and use the hardware at full performance capability up until the last few % of power remaining before I get the critical warning and it shuts down - I know the consequences, it is my choice. I would never intentionally buy anything that did not give me this sort of choice.

Jan 28, 2018 3:58 AM in response to agmillan86278

I've had a slow, buggy iPhone since updating to iOS 11 and my problem was solved by completely wiping my phone. I said I was going to do this in earlier posts and just wanted to confirm that it did solve the problem. I did not restore from a backup since I was told that this would not resolve the issue. I set it up as a new phone and just re-synced with iTunes to get my music back and logged back into iCloud. Be sure to backup all your photos and videos and anything else you want to keep before doing this. I'm not saying this solution will work for everyone but it did for me.

Jan 28, 2018 6:58 AM in response to MichelPM

MichelPM, yes I did.


Just before Apple admitted the CPU throttling and following the findings presented in this same thread, I ordered a new battery from ifixit and changed it myself (there is an old post around here where I explain this). Also I checked with CPU Dasher that my CPU went back to 1400MHz.


To sum up: The phone is performing much, MUCH, better, it is now usable, but usable is not what I expected from a 1000€ phone.

Besides a general clunkiness that is clearly noticeable in every aspect, and that was not there with iOS 10, which was butter smooth, I'm still experiencing the following issues:


-The keyboard is still suffering from mini freezes randomly, albeit it performs far better than it did before the battery replacement.
-Siri sometimes takes 10 to 15 seconds to start listening when long pressing the main button, even more when saying 'Hey Siri'. And many times she starts thinking for a while (after receiving whichever order I gave) and eventually just does nothing and closes.

-Fast forwarding (or rewinding) music or podcasts sometimes (many times) does the opposite thing.

-Many emails just don't load when trying to read them, I have to close the mail app and open it again.
-Sometimes the camera app takes ~10 seconds to open, others just 2 or 3. Taking pictures is also laggy.

-Youtube suffers from ~10 second freezes when receiving user input or when ending a video, and sometimes does not orient the screen properly (this could be youtube's problem, but it worked fine on iOS 10).


Maybe you are right and it all gets better when they let us opt out, maybe all those micro stutters is the throttling jumping in for a micro second, maybe ifixit batteries are just not as good as apple's, we will see.


In any case, I STRONGLY recommend to have your batteries replaced, the performance improvement is huge.

Jan 28, 2018 7:37 AM in response to Marc007@

Marc007@ wrote:




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


He’s giving users a choice between having a phone that runs slightly slower or one that crashes and shuts down any time that there is a heavy drain on the battery. I guess some people would prefer that their phone shut down randomly.

Jan 28, 2018 7:44 AM in response to Lawrence Finch

Lawrence Finch wrote:

I guess some people would prefer that their phone shut down randomly.


I'd prefer that my phone shut down randomly once a month (which is what it was doing) than that it be very slow and difficult to use every day of the month.


Even better would be to have iOS tell me that my battery needs to be replaced, and that my iPhone performance will be compromised until I replace the battery. That feature is coming in the next iOS update, thankfully.


Best of all would be if Apple didn't push the CPU+battery combination to its limits, so that iPhones could continue to operate at full speed for several years, even as the battery ages. This used to be the case, but with the CPUs in the iPhone 6 and 6s (at least) they began running into this problem.

iPhone 6 very slow with IOS 11 update

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