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just upgraded from jquery 1.4.2 to 1.4.4 and i’ve encountered a performance problem which i think has something to do with a lot of class selectors,
sometimes even explorer crashes and in 1.4.2 its working perfect..
Twitter has had performance issues with 1.4.4 and went back to 1.4.2 until the jQuery team fixes it. The creator of jQuery talks about it a little bit here in terms of the selector engine:
http://ejohn.org/blog/learning-from-twitter/