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fastest will be the smallest diameter with the most width up to a point. so 15x9 with 255's would be quickest IMO. it's not just the weight of the wheel that matters but where the weight is. a lot of the weight of a wheel is in the barrel. the barrel of an 18 is farther from the center of the wheel than the barrel of a 15. the farther from the center the weight is, the harder it is to accelerate it. in a straight line this is basic physics.
corners are more complex. if the tire side wall is too big you get a squishy, wallowy tire. this makes the car slower in transitions. and the contact patch is less consistent when the tire is loaded.
diameter change will change the over all gear ratio. smaller diameter will shorten 0-60 times and 60-0 times.
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