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…Just as long as people remember that, as long as you’re at least somewhat considerate of the selectors you pass to jQuery, you really don’t need to worry about selector performance too much. jQuery does an excellent job of optimizing as much as possible. But it’s good to understand the basic concepts, like right-left parsing.
Sure – $(‘div’).find(‘p’) may potentially be fractionally faster than $(‘div p’), but I won’t lose sleep if I use the latter. Readability is more important in most cases….or unless there is noticeable slowdown in your page’s performance. :)