My 6S is slower than my 6th gen. iPod Touch. I took it in to Apple because the battery life has been terrible, and Coconut Battery reports that the battery is between 75 and 80% capacity with 350 cycles on it. Apple's diagnostic shows the battery has 93% life which means they won't replace the battery, so now I'm stuck with a phone that's way too slow, with terrible battery life, and I can't get Apple to fix it.
Maybe go back and show them the CPUDasherX apps' CPU speed, and the GeekBench Benchmarks, and the Battery Life App with the wear level showing 75-80%?
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I can see why Apple might slow down a device when the battery is going south, so that the device won't die prematurely while you need it and will keep it running longer,
but maybe add that as an option on the battery settings like we have "low power mode".
I replaced the battery in my iPhone 6 this summer when it was at 78% capacity, and the battery test tonight is showing no wear and 100% of original capacity (1751mah from Batteries+Bulbs).
My speed in CPUDasherX is 1400mhz, and my Geekbench scores are where they should be at 1404/2638 (the best ever was 1581/2687 on Nov 1st). But my iPhone 6 just takes way too long to launch apps - it's sluggish and it's not a battery or clocking problem.
I see videos online where apps launch slower after older devices get an iOS upgrade, unrelated to processor speed or battery, and mine is even worse than the worst of those. Notes and reminders or calendar take 4 seconds to load while they load in 1 second on my 7+ and X. And a few other built-in apps take up to 8 seconds to load on the iPhone 6, while only needing 2 seconds to load on my 7+ and X. And Safari with macrumors open upon launching takes 20-22 seconds to load, vs 4 seconds on my 7+ and X.
Now I know the two problems are unrelated, but it's just another notch in the Apple's belt in slowing down older devices to force an upgrade for those who don't know better (like needing a battery) or who are at their wits end with a slow device that doesn't get better with restoring to factory and being unable to roll back to 10.3.3 (me).