The Framerate in the Mac version of Duke 3D, on the Macbook Pro Retina 15inch, is very low. It peaks around 18-20 and dips to almost 5 in most areas in the game.
Is this an issue that can be fixed? It seems like the emulation runs extremely slow - Even the GOG menu is very laggy.
clearly your macbook pro is not nearly as capable as the computers that were around when this game came out. you should consider an upgrade.