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You are probably iterating over each of your edge points and incrementing at each of the respective accumulator pixels. Profile your code. Consider the number of edge points you have versus the relative size of the images and circles.
If cache misses are a problem, try thinking backwards. Consider hashing the edge points in such a manner that you can iterate over each pixel p in the accumulator, quickly find the edges that contribute to p, and move to the next pixel in the accumulator.
