I provided a patch about 8 months ago to improve the performance of
the core height and width and dimensions inner/outer[height/width]
methods.

http://groups.google.com/group/jquery-dev/browse_thread/thread/a4becc9a5cc34fea/

I put together a test page to help make my point...

http://dev.helgeson.info/dimension/

I average the following results using FF3/XP...
(percentages of the unpatched method time)
height & width ~ 73%
innerHeight & innerWidth ~ 44%
outerHeight & outerWidth ~ 19%
outerHeight( true ) & outerWidth( true ) ~ 32%

I updated the patch to be compatable with 1.3.x

http://dev.jquery.com/ticket/3082

In addition to being more efficient, the methods also simplify the API
by overloading the height/width methods. By passing in a string
("padding" or "border" or "margin") you get in return, the dimension
through that property.
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