We are trying to use the standard tag library in our JSP pages. But there is a huge performance degradation using the expression language in these tags. In our benchmark test, using the standard tag library in JSP page is 10 times slower than using the embedded <java> tag directly. I am not sure if anybody else has encountered such problems, but I would like to bring it up to your attention.
We have not heard many general complaints, but ongoing performance investigations are being conducted; Peter Lin and others are investigating various performance issues and areas that present likely candidates for optimization. I shall soon apply a patch, for instance, to cache parsed representations of XPath expressions. If you suspect the problems are both (a) addressable and (b) apparent across all of JSTL, then profiling reports might help us determine where (and ultimately why) the implementation is slow on your configuration.