Same here, my iPhone 6S was running great prior to iOS 11, now I notice significant delays and hiccups. Current main battery wear is at 13%, but I also run a smart battery case which has seen way more discharges to zero, which I think is also slowing down the phone as it priortizes it first. Just annoys the crap out of me that I have a phone I know is still powerful, but is being throttled due to an algorithm based on cycle count versus battery life percentage.
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