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Thanks. Make sense. I was confused as it not list devices that also support iOS9 like the iPad mini 3.

Nor the iPad 2 and iPhone 4s.

How well does ios9 run on a 1ghz dual-core/512mb device like the 4s?

Worse than iOS 6/7, better than iOS 8.0

iOS 9 has the same performance as iOS 8.4