First, I own one of those new-fangled web apps (http://agilezen.com/ http://agilezen.com/). It's built on jQuery, has a fairly complex Javascript-driven UI, and

First, I own one of those new-fangled web apps (http://agilezen.com/ http://agilezen.com/). It's built on jQuery, has a fairly complex Javascript-driven UI, and nowhere do I manipulate hundreds or thousands of DOM elements. Second, I wasn't arguing against libraries -- I was saying that the difference in performance is probably not what you want to use to decide which library to use.