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With zoom factor set to 1 each cell of Conway's Game of Life is represented on a Retina display by a 2x2 pixel block (see attached photo). Using the native resolution of a Retina display would increase GPULife's hardware requirements even further! ;-)
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On a Retina display the frame rate is displayed almost completely off-screen(see attached photo).

[photo taken from a MacBook Pro with Retina display]