That's interesting, but it doesn't really have any bearing on the thrust of the article; none of those things are cause for the slowness of current Markdown implementations.
(Also, numbered lists are one of my pet peeves with Markdown, since renumbering lists sucks. His way seems more usable.)
Still, I can see that bugging me. I could number a list with all 1.s, but that's like writing code with no indentation or extra spacing. The style of source material matters to me.
(Also, numbered lists are one of my pet peeves with Markdown, since renumbering lists sucks. His way seems more usable.)