iOS 8.1.1, iPhone 4S, and iPad 2: A little faster, kind of, sometimes
It would be a stretch to say that iOS 7.1 made the iPhone 4 feel fast, but the update improved the phone’s performance as much as could reasonably be expected for then-three-and-a-half-year-old hardware. It took what had been a disappointing update and made it usable.
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Story added 20. November 2014, content source with full text you can find at link above.