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Re:Metal – Apple’s new graphics API by fleitz on Tuesday June 03, 2014 @12:05AM (#7838073)
The Metal API is akin to an ObjC port of OpenGL.

If you have access to OpenGL/CL Metal isn't going to give you much (other than perhaps a prettier API). Since most PC/Mac games are written in OpenGL/CL it will only make things slower.

The Metal API only really gives you extra perf if you're currently using SceneKit.

Re:Metal – Apple’s new graphics API by valleyer on Tuesday June 03, 2014 @12:40AM (#7838188)
That’s not what they said in the keynote… they compared it favorably in terms of performance to GL