I was looking at several scraping solutions (e.g. imacros, selenium) that can handle DHTML for a project and they all have significant performance issues since they need to render the actual pages before processing them. A couple of thousands or rows isn't a problem but try anything more and you got a real performance bottleneck.
DHTML is server-side. You mean AJAX. Also, think of the page as an interface to a more lightweight web service. You should probably be parsing that directly.
