Annoyance has been reserved for individual apps, and the change of Control Centre in iOS 11.
Battery life is fantastic as well. I paired mine up with a thin silicone case and Qi receiver for wireless charging.
GeekBench is like one or two dollar in the AppStore. If the score has a significant difference with other iPhone 6's probably you're having a battery problem.
Also factory resetting the phone can help. Try to figure out if there are any apps using a lot of battery in your battery overview. Some apps consume more in terms of background activity than others.
That got it back to about the speed I'd expect it to be. I still suspect that I'll take it in for a battery swap before the end of the year - but it might be worth trying if it's the slowness is a hindrance for you.
Apple once told me I had a good battery even though my phone would randomly shut off and attaching to a charger was the only solution to get the phone to turn on. Thankfully I had AppleCare and pushed for them to replace the phone.
My iPhone 7 was had a crippled batter after one year - it performed like an iPhone 6..
Only thing I’ve noticed is that some websites clearly don’t really expect phones’ screens to be this small any more, though.
I'm still using my iPhone 5S on iOS 8, and I am very happy with its performance. I've never had any issues with sluggishness, lag, etc.
That's the ticket. The further the OS drifts the the original hardware, the more painful the experience.