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Most of this shit shouldn't matter, over-analyzing it will just make you appear stiff. Walk with confidence, and be able to see where you're going (not looking down or so focused on one point in the distance that you can't check out your surroundings.)
Good posture is a must, and speed doesn't matter so long as:
a) You're not the /fa/ggot who insists on crawling along at a snail's pace, and
b) You don't knock over any kids, old people, etc.
But then again, if you're basing your gestures on what people on 4chan claim to be fashionable... Moonwalk yourself to the nearest train tracks, now.