Measuring performance

What is the ideal way to measure the performance of a specific bit
of XSL code?  Are there any tools available for determining the
areas of your XSL code that are causing the heaviest loads on the
parser? Also, there are a few resources that indicate the efficiency
of using certain commands over others (ie using count instead of
xsl:number for certain applications).  Is there any place that
provides a collection of these helpful suggestions?

Thanks,
Joe Ortiz




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