Earlier quoted context omitted.
The battery issue is unrelated to your slowdowns if you were experiencing them constantly. Lost in all the media reports is that the throttling only happens at peak system power demand. My 6s Plus also was constantly slow until last week, when I backed it up, wiped it, and restored. Now it's as fast as ever, on the latest iOS. We take the underlying computer for granted, but apparently the iPhone can benefit from a c…
This is not true according to my experience. See https://imgur.com/a/VH0Bs . Note that in my case the performance restoration came about after I had my battery replaced -- no data wiping or other system cleaning occurred. > Lost in all the media reports is that the throttling only happens at peak system power demand. Throttling at least occurs during app loading. Apple admits as much and it was true (subjectively) in…
In my own case, everything was slow. Loading apps, loading web pages, whatever. And the difference after a clean install now is huge. Went back and did the same to an old iPad that I stopped using for its sluggishness, and it's usable again.
Complex devices, so there's certainly going to be a complex set of problems, but I think that some of it is due to us taking Apple's message that iOS devices are appliances to heart, whereas the truth is that these portable computers still need mysterious maintenance rituals. It's been impressive, but Apple's still got some work to do to make these things bulletproof.