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What sort of computer do you have? What specs does it have? Now imagine rendering your Photoshop stuff on a computer with mid-1990's specs. Next, imagine rendering stuff on a computer with mid-1990's specs, except that stuff has been developed in Maya and has all sorts of complicated shit going on.
That shit takes time.
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It has very little to do with computing power now and then, ray tracing a 3D scene is more complex in a few orders of magnitudes than applying a Photoshop filter. Even in mid 90s specs the Photoshop filter would be fairly quick, a few seconds maximum, where 3D rendering an AO cam, even in today's specs, would take a minimum of a few hours.