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Seems to just be a list of iOS 9 supported devices...

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

iPhone 4s can run iOS 9 and is not on the list.

iPhone 4s is out of official support as soon as the iPhone 6s is released to market.

they always give users the 'last' iOS version but I highly doubt any work will go into patching it in future.