Absolutely zero lag on my iPhone 6 that has been consistently restored from backups from device to device going back to the iPhone 4.
Yes, 6 is okay. I was talking about Plus.
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At the risk of appearing dismissive or worse, the solution is to vote with your wallet. If you are continuing to experience issues with Apple products, the obvious solution is to buy something else. If enough people are truly having these issues, and they go spend their cash on other brands, Apple will lose market share, and either fix the issues, or shutter their doors.
With that said, however, my immediate family (myself, my wife, our 6 kids, their spouses plus 3 grandkids) owns a total of 16 iPhones, more than 10 iPads and 6 Macs. As the guy that gets the call when something is wrong or lagging or sluggish, I can say that not one of them has any ongoing issues with the stuff mentioned here. Most are running the latest version of iOS and OS X. Maybe we're just lucky... or ...
It's not 'real issues' what bothers me. Luckily, they've solved most of the issues brought by iOS 7. The thing which I have problem with is not all animations are smooth (aka '~60fps'). Opening multitasking on Mini 4 is like 4 fps, really.
I think that only some people do perceive this. Others really don't care, as long as device does what they need, they are ok. My mom wouldn't care.
Maybe that's why your relatives don't complain (and no offence, I'm happy for them).
And that other thing you said about not buying their products, well, firstly, I really didn't think that the newest model could stutter, secondly, I'm so deep in Apple ecosystem. I have bought lot of apps, accessories and devices and as I said, I have seen Androids stutter too.
I just have this feeling that when enough people complain, they could make it better (?). (And yes, I also reported to Apple).