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The 6S has sold way more than the 5S ever did in this point in the cycle
Relative sales. The 6S did not perform as well compared to the 6, as previous generations to those immediately before them.
 
Did you really think it was that bad? Compared to what, the 5s? To me felt fast, but I also compared to the 4s I moved up from…

Late response here, you were responding to how I thought the iPhone 6 felt like a performance regression. I was also coming from a 4s running iOS 8, of course it was faster than that. But still, the iPhone 6 felt slow for being the newest iPhone. It was definitely slower than my wife's iPhone 5s which was running iOS 7 at the time, so maybe iOS 8 is to blame, but maybe also having to render to a larger screen was a factor.
 
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