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I could pick any OS apart. I’m typing this as win10 reboots because clicking “uninstall” in add and remove programs doesn’t respond...at all...

I am finding iOS 11 to be less polished (things happening like the pic above) but functionally it’s been stable and reliable for me. Nothing in iOS 11 has hindered my usage or workflow.
 
Wondering one thing... do you obsessively close apps when you are not using them? I used to do that and had battery life issues but after doing some research I discovered that you are actually far better off to not force close apps unless they are misbehaving/unstable. It may be somewhat counterintuitive but my battery life actually improved quite a bit as it’s more power efficient not to have to relaunch apps and iOS has really great memory management.
iOS memory management has taken a large regression in iOS 11 compared to iOS 10. Hopefully 11.3 turns it around.
 
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I’m guessing some people have less tolerance for stuttering and lag. Also gessing some apps we have installed might not like iOS 11. The people who have no issues may not have these installed. Different hardware in each phone even in the same model ( difference makes of modem , ram chip etc) . iOS 11 has been awful on my 6splus and same on the X. The new beta is a lot better so fingers crossed

Uh... I'm pretty paranoid with "perfection", so I'm absolutely not tolerant about that. And my X worked awesomely with every iOS 11.x.x version. No stuttering or lags. So, yeah, maybe some people are less tolerant, but not everybody is in that case.
 
I haven't read all the responses, and perhaps some of these have already been pointed out, but I think the following may be factors in this (I have had few issues, but believe the issues do exist):
  • Age of hardware
  • software configuration (modem manufacturer, for example)
  • Battery status
  • Clean vs new install
  • Software configuration (how many and which apps)
  • Interaction with cellular network (my phone drains much more quickly when I'm either in a low cell area or in an area, like NYC, where there are dozens of towers and wifi hotspots)
  • Tolerance for relatively minor issues (the lag issue comes to mind)
  • Light use vs heavy use
There are probably several others, one of which may simply be "luck".
 
The main reason I think is that everything is built to a tolerance. No 2 iPhone X are identical for example. Especially when comparing down to the NM level they use in making processors for example.

Apple will stipulate a tolerance for every component as they are mass produced and by differing manufacturers. Most people will have a phone that sits smack bang in the middle of that tolerance. Others will be on the extreme left/right and anywhere in between.

To my mind that is probably the phones that develop the issues, amongst other stuff like usage, apps installed, cellular service reception, wifi service reception etc etc.
 
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The main reason I think is that everything is built to a tolerance. No 2 iPhone X are identical for example. Especially when comparing down to the NM level they use in making processors for example.

Apple will stipulate a tolerance for every component as they are mass produced and by differing manufacturers. Most people will have a phone that sits smack bang in the middle of that tolerance. Others will be on the extreme left/right and anywhere in between.

To my mind that is probably the phones that develop the issues, amongst other stuff like usage, apps installed, cellular service reception, wifi service reception etc etc.

Is this true for all phones? Tablets? PCs?
Amongst all the iDevices and Mac's in my family, I have seen, and continue to see discrepancies / issues that I have not see with any other line of devices. Even the two Razer smartphones we have show comparable issues.
This is puzzling and concerning. I have not experienced and issue like this before across so many devices.
 
Everything is built to a tolerance. Even something as expensive as a Bugatti Chiron.

The problem is perception of problems as people will naturally report issues on Internet forums. Posts would be pretty boring if everyone posted ‘hey all my electronic devices are performing spot on’.
 
I agreed it’s mess but they’re trying their best to short out as many bugs as possible.
Yah but it should’ve been better to start they need to stop rushing the releases because it’s a disgusting user experience for people with the newest Apple devices. I’d much rather have Apple delay iOS 12 till late October early November and have a more polished os from the getgo.
 
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I have had no issues with iOS 11 on my 7 Plus, my X, or my 10.5 Pro. I would suggest erasing all content and settings.
I’ve restored my devices multiple times as the updates have released the latest being 11.2.5 and the same issues are still present. Mainly random app instability such as podcasts or music crashing upon opening. Not to mention the same stupid stuttering system animations mainly opening the control center to switch apps. It’s very irritating to have these issues this far into iOS 11 and on the latest iPad. I also noticed the 10.5 iPad Pro is mainly smooth and chalked that up to it having a few million less pixels to push around. Even so 12.9 was perfectly fine on iOS 10 so I know it’s a software issue.
 
I’ve restored my devices multiple times as the updates have released the latest being 11.2.5 and the same issues are still present. Mainly random app instability such as podcasts or music crashing upon opening. Not to mention the same stupid stuttering system animations mainly opening the control center to switch apps. It’s very irritating to have these issues this far into iOS 11 and on the latest iPad. I also noticed the 10.5 iPad Pro is mainly smooth and chalked that up to it having a few million less pixels to push around. Even so 12.9 was perfectly fine on iOS 10 so I know it’s a software issue.

Very strange. You hear this stuff and unfortunately, I have no suggestions. I haven't had any such issues with my iPhone or iPad except for I think 11.2.5 beta 3 on my iPad. A quick erase all content and settings fixed it. Have you restored and set up as a new device or from a backup? Also, try the erase content and settings option (different from restore) if you haven't. It worked for me on my iPad.
 
Very strange. You hear this stuff and unfortunately, I have no suggestions. I haven't had any such issues with my iPhone or iPad except for I think 11.2.5 beta 3 on my iPad. A quick erase all content and settings fixed it. Have you restored and set up as a new device or from a backup? Also, try the erase content and settings option (different from restore) if you haven't. It worked for me on my iPad.
No I always set up as new, my setup takes a solid hour between my iPhone and iPad Pro. Also thanks for the tip but I’m just waiting for iOS 11.3 according to the forum the stuttering issue has finally been fixed. Just wished it had been a higher priority thing as those issues cheapen the “ProMotion” experience of the new iPad Pro.
 
Not having a clue what "stutter" and "lag" are, out of curiosity, I googled them and, what do you know, there are complaints about them every year covering every IOS version for many years.

I went back to 2012 and then gave up, realising that, as I don't seem to have ever had the problem with any of the phones I have owned, it cannot be too serious.

Are certain peeps being too picky ?

Whether the "problem" is ever solved for users is unknown to me.
 
Not having a clue what "stutter" and "lag" are, out of curiosity, I googled them and, what do you know, there are complaints about them every year covering every IOS version for many years.

I went back to 2012 and then gave up, realising that, as I don't seem to have ever had the problem with any of the phones I have owned, it cannot be too serious.

Are certain peeps being too picky ?

Whether the "problem" is ever solved for users is unknown to me.
Yes I’m going to be picky when my very expensive “Pro” iPad has stuttering when a staple feature is how “smooth” it is.
 
Nothing really worthwhile has come out on iOS for iPhone since iOS 9.3.5.
The .3.5 versions of each numerical release are always the most stable & best for that year. My advice for anyone in the future is:

If you buy an iPhone new in the first year it was manufactured, continue to upgrade its software via apple's monthly dance until the eminent release of the next numerical OS in September.

Then stop! Do not upgrade past the version number it shipped with.

If you buy a 3 generation old iPhone new (SE, 6S) and it comes installed with the latest OS, well ... you're pretty much screwed. Don't buy old iPhones with the latest OS installed on them even if they are brand new
 
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Not having a clue what "stutter" and "lag" are, out of curiosity, I googled them and, what do you know, there are complaints about them every year covering every IOS version for many years.

I went back to 2012 and then gave up, realising that, as I don't seem to have ever had the problem with any of the phones I have owned, it cannot be too serious.

Are certain peeps being too picky ?

Whether the "problem" is ever solved for users is unknown to me.

That’s probably why you’re not noticing as many problems then. Coming from someone who is highly sensitive to lag and stutter (never was until iOS 7 because it barely existed before then, especially on new hardware), iOS 11 is just terrible.

What we mean by stutter and lag is just generally swiping, scrolling and interacting with the device. In iOS 6 this was rock solid and didn’t have any “judder” like you get when going over a bumpy road. That’s what iOS today is like: generally smooth until you ride over a rough patch on a road. The Twitter App doesn’t scroll smooth like say Safari, neither does YouTube, Instagram or Facebook. And those are apps that millions use every day. Try it yourself, scroll up and down in Safari, it’s fluid and smooth isn’t it? Now do the same in the YouTube app. Stutter, stutter, judder, judder. I know those are third party apps but I believe it’s due to the whole iOS 7 redesign Apple did in 2013, it’s like it messed everything up with how they ‘recoded’ everything or something. Apps just aren’t as smooth in terms of scrolling and just don’t feel as solid. Heck, even the App Store itself stutters when scrolling up and down and left to right through apps, so does the Watch App and the Music App so it’s not just third party apps. They feel like they run at 30fps at best (especially YouTube), not 60fps like they are supposed to and should do today. This is especially noticeable on an 120hz iPad Pro which only shows it up even more.

The whole OS just doesn’t feel as stable as it once did in the past and it’s especially bothersome to me when I compare it next to my five year old iPhone 5 running iOS 6 and notice how much more stable, smooth and rock solid the latter is. It is shocking to see the difference and there just isn’t any excuse for it considering the crazy-fast processors we have in iOS devices today. You can’t just throw hardware at everything with 120hz refresh rates, faster processors etc. and think it will magically fix poorly optimised software. That is exactly what they are doing in my view and it saddens me because it used to be the complete opposite.

We just expect more from Apple instead of this whole “well it’s good enough” mentality because that’s what they used to offer us and those that complain on here just want said quality back.
 
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Even when Apple themselves admit to slowing down phones intentionally, we still have people who say "I don't notice my phone slowing down" so obviously, it's a matter of perspective.

Personally, Apple's confirmation of their practice to slow down devices intentionally is enough proof to me that it is an objective FACT that iOS is SLOW with certain devices.

Again, IT IS A FACT THAT IOS 11 IS SLOWER WITH CERTAIN DEVICES.

How someone feels about their devices subjectively doesn't take that fact away.

Now personally, I think my iPhone 6+ on 11.2.5 has finally caught up to however it was back in 10.3.3 (or at least as I can remember it), with some minor hiccups every now and then, but it is now for the most part responsive and usable again. But I know it could be better, and again, that is an OBJECTIVE FACT. At least until iOS 11.3 comes out.

Edit: also, this slowing down practice has happened on Mac as well for ages. We used to be able to trick the OS into thinking no throttling is necessary... back when Snow Leopard (<=10.6.8) was around. Lion came and changed that.

Guess which version of Mac OS X is now being touted as the most stable and performant?
 
Stutter and Lag. We have seen these in all releases. Some more. Some less.
While bothersome to some, for me what is more appalling is the other stuff. Email that has issues across several releases. iMessage that still shows out of sequence. Airdrop that usually works instead of "it just works". Apps that crash or springboard crashes. Middle of the night random reboots. App and Tab data reloads when there is plenty of RAM left. iCloud that works until it doesn't. The list goes on. Then add the Applewatch. Add the MB (various models).

For the first time in a long while, I have changed to an Android phone. Scary thing? After almost a month I am finding it to have far less issues and is more stable than my iPhone. Apple really really needs to take a step back and embrace the former "It just works!" mentality.

MHO YOMV
 
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That’s probably why you’re not noticing as many problems then. Coming from someone who is highly sensitive to lag and stutter (never was until iOS 7 because it barely existed before then, especially on new hardware), iOS 11 is just terrible.

What we mean by stutter and lag is just generally swiping, scrolling and interacting with the device. In iOS 6 this was rock solid and didn’t have any “judder” like you get when going over a bumpy road. That’s what iOS today is like: generally smooth until you ride over a rough patch on a road. The Twitter App doesn’t scroll smooth like say Safari, neither does YouTube, Instagram or Facebook. And those are apps that millions use every day. Try it yourself, scroll up and down in Safari, it’s fluid and smooth isn’t it? Now do the same in the YouTube app. Stutter, stutter, judder, judder. I know those are third party apps but I believe it’s due to the whole iOS 7 redesign Apple did in 2013, it’s like it messed everything up with how they ‘recoded’ everything or something. Apps just aren’t as smooth in terms of scrolling and just don’t feel as solid. Heck, even the App Store itself stutters when scrolling up and down and left to right through apps, so does the Watch App and the Music App so it’s not just third party apps. They feel like they run at 30fps at best (especially YouTube), not 60fps like they are supposed to and should do today. This is especially noticeable on an 120hz iPad Pro which only shows it up even more.

The whole OS just doesn’t feel as stable as it once did in the past and it’s especially bothersome to me when I compare it next to my five year old iPhone 5 running iOS 6 and notice how much more stable, smooth and rock solid the latter is. It is shocking to see the difference and there just isn’t any excuse for it considering the crazy-fast processors we have in iOS devices today. You can’t just throw hardware at everything with 120hz refresh rates, faster processors etc. and think it will magically fix poorly optimised software. That is exactly what they are doing in my view and it saddens me because it used to be the complete opposite.

We just expect more from Apple instead of this whole “well it’s good enough” mentality because that’s what they used to offer us and those that complain on here just want said quality back.

Thank you for explaining the terms. I will have a look for them over the next few days.
 
iOS 11 nearly bricked my 6s. I could not load webpages over LTE. The phone crawled all the time.

I contacted Apple - they just told me well, we just released it. Updates will fix it.

I went back to 10.3 and have not touched iOS 11 since. iOS 11 is the first OS release I have not put on my device.
 
iOS 11 is good on newest devices, but no so on 5S or 6.
not true , i have the 8 with the a11 cpu and frame drops and app crashes occur from time to time and its really annoying on device this powerful , hope ios 12 or 11.3 will fix this
 
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