XSLT/XQuery Performance Profiling Overview
Whether you are trying to identify a performance issue that is causing your production XSLT/XQuery transformation to not meet customer expectations or you are trying to proactively identify issues prior to deploying your XSLT/XQuery transformation, using the XSLT/XQuery profiler feature is essential to helping you save time and ultimately ensure a better performing, more scalable XSLT/XQuery transformation.
The XSLT/XQuery profiling feature can use any available XSLT/XQuery processors that could be used for debugging and it is available from the debugging perspective.
Enabling and disabling the profiler is controlled by the 
/
Profiler button from the debugger control toolbar. The XSLT/XQuery profiler
is off by default. This option is not available during a debugger session so you should
set it
before starting the transformation.