Google is hosting jQueryUI css at this linkhttps://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery.ui.all.css
If you look at this code directly, it is importing the css using @import which can be slow. You may want to factor the import into its parts to gain a slight performance benefit:
https://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery.ui.base.csshttps://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery.ui.theme.css
The localization files are also available in the UI svn: http://jquery-ui.googlecode.com/svn/trunk/ui/i18n/
