It depends on the selector and the browser. Something like $(".myclass") is worth caching on IE7 because it requires a pass through the entire document; there's no `querySelectorAll` or `getElementsByClassName`.
I wouldn't start by caching selectors all over the place unless you profile and see that it's slow. Doing a lot of selecting in a `scroll` or `mousemove` handler would be a bad idea though: http://ejohn.org/blog/learning-from-twitter/
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It depends on the selector and the browser. Something like $(".myclass") is worth caching on IE7 because it requires a pass through the entire document; there's no `querySelectorAll` or `getElementsByClassName`.
I wouldn't start by caching selectors all over the place unless you profile and see that it's slow. Doing a lot of selecting in a `scroll` or `mousemove` handler would be a bad idea though: http://ejohn.org/blog/learning-from-twitter/