My iPhone 6 used to be snappy, but now takes almost 10 seconds to just open an app. Perhaps new OS updates are not as well-optimized for older iPhones as they are for the latest version.
Ars Technica's Android 8.0 deep-dive has some interesting charts showing Android device performance deteriorating over time:
I'm not sure that the new updates are doing much to harm older phones. My iPhone 5 is still running as quickly as it was when I got it. In fact, the latest updates seem to have made things somewhat faster.
Unfortunately I'm now at end of life as far as iOS updates go. I don't think I will bother with updating the hardware for some time yet.
If you're on a Mac, try Coconut Battery to check the battery health. Mine was showing 30% of original capacity, which explained why it kept draining quickly. Resetting (recalibrating?) it by letting it drain completely and letting it charge got it back up to 80%. I don't know why it had gotten into a bad state :(
> I don't know why it had gotten into a bad state :(
just ordinary use makes them that way. Calibrating is necessary for all lithium batteries, but normally you charge when you think its time and don't wait for the battery to get empty first
Ars Technica's Android 8.0 deep-dive has some interesting charts showing Android device performance deteriorating over time:
https://arstechnica.com/gadgets/2017/09/android-8-0-oreo-tho...