#3 Optimize creating of transformer objects

[František Řezáč]

Currently the transformer factory and transformer objects are created again for every single request. This is highly inefficient, so there should be some option to turn on some kind of caching, probably using these techniques:
http://www.javaworld.com/javaworld/jw-05-2003/jw-0502-xsl.html
http://www.developer.com/xml/article.php/1453021/Optimizing-Stylesheet-Execution-with-the-Java-Transformation-API-for-XML-TrAX.htm
http://marc.info/?l=xalan-j-users&m=106251075208008&w=2