It's possible that they're using it for GPGPU acceleration.So metal code be used for UI calls and could give the appearance that it is working faster but indeed it might be just about as fast. The render of a page would not interact with metal. Safari might interact with Metal if they are using it to render some of the graphics. I would say it is optimizations of the render engine inside safari. These are lurches forward in builds as there is a nightly build of the rendering engine since it is used all over the web. I also suspect that the whole OS has more of a RAM diet and this allows safari just a touch more resources. The iPhone 6 should have shipped with 2 gigs of ram to accommodate the beastly mess of iOS 8 but that is another story all together. I would say the iPad air 2 should see the best bump with iOS 9 as clearly the hardware was over kill for iOS 8. I look forward to a stable and clean release this time. I know that is probably wishful thinking though
http://memkite.com/blog/2014/12/18/...lerate-on-iphone-6-5s-ipad-air-and-ipad-mini/
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