Link: http://www.stylusstudio.com/xquery_profiler.html
Source Author or Organization: Stylus Studio

The Stylus Studio XQuery profiler is very similar to a Java profiler - it's a tool for developers to optimize your XQuery code by running detailed performance tests which help you find and eliminate your application bottlenecks, thus enabling you to significantly improve your XQuery performance. The XQuery profiler automatically generates a detailed XQuery performance profile of your XQuery application that displays a detailed account of what sections of XQuery code took how long to execute, for example, you might find that a poorly written FLWOR block takes up +90% of the execution time and is a good candidate for optimization. Using the built-in integration with Stylus Studio's XQuery Editor, you can click on any line in the XQuery profile and Stylus Studio will highlight the line of XQuery code in question. The XQuery profiler is highly customizable, allowing you to specify the layout of your report, and other parameters, such as the maximum depth of a trace, etc. Learn how to maximize XQuery performance by watching a free online video demonstration entitled: How to optimize XSLT and XQuery Performance.