Fair point, GavinB. If you defined "efficiency" in terms of achieving the most benefit from an eyeball using the fewest computations, then I'm not sure whether

Fair point, GavinB. If you defined "efficiency" in terms of achieving the most benefit from an eyeball using the fewest computations, then I'm not sure whether a Bayesian superintelligence could approach "efficiency". Maybe the theoretically optimal program to run on the eyeball's input, would itself require exponentially vast brainpower to calculate! But I would concede a much higher chance that a Bayesian superintelligence could get bored at exactly the right time, than that it could simulate all possible universes.