You're right, the code is not performant at all. At the time I was hacking around and just happy to get something working. I think the code is a tempting distraction, but I was trying to say that browser API performance is not always what you would expect and sometimes you need to get creative in order to get the results you want.
okay but i think we aren't being too optimistic about browser performance, memory access patterns aren't the problem, and canvas implementations are adequately well suited for the flood fill problem space, which directly contradict three assertions you did actually say, even if they weren't what you were trying to say
