Xalan-J is hellishly slow. It takes 50 seconds to perform 500 straightforward transformations of the same (preloaded) 600k document. That's 0.1 seconds per transform, way too much considering that I'm doing rather simple stuff so far and that I've optimised the XPath about as much as it is possible to (root anchoring, position, even modes, etc) -- but it looks as if their XPath querier isn't very smart. Libxslt kicks the hell out of it of course... *sigh* I guess I'll have to look for a fast Java XSLT processor now, or start using ugly extensions.
