Does anyone here have a pointer to a PORT map for the Mega ( to get an idea of what I want to do if I don't do a good job explaining it here, look here: http://www.instructables.com/id/Arduino-is-Slow-and-how-to-fix-it/). I want to be able to do direct PORT access on the Mega rather than DigitalRead's and Writes in order to speed up I/O but I can't find documentation comparable to what's offered for the 168 in the above article.
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Universalr rule of performance tuning - measure first.