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      <h1>Performance Analysis</h1>
      <p>Saxon comes with a simple tool allowing profiling of the execution time in a stylesheet.</p>
      <p>To run this tool, first execute the transformation with the <code>-TP:filename</code> option, which 
         will gather timed tracing information and create a profile report to the specified file
          (or to the standard error output if no filename is given)</p>
      <p class="command">java   -jar   <i>dir</i>/saxon9he.jar  
 -TP:profile.html   <i>source</i>   <i>stylesheet</i>
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      <p>Then view the resulting <code>profile.html</code> file in your browser.</p>
      <p>The output identifies templates and functions in the original stylesheet by their name or match pattern,
          line number, and the last
few characters of the URI of their module. For each instruction it gives the number of times the instruction
was executed, the average time in milliseconds of each execution, and the total time. Timings are given both gross
(the time for a template including all the templates it calls recursively), and net (the time in a template excluding
          time in its called templates). The table is sorted
according to a weighting function that attempts to put the dominant functions and templates at the top. These will
not necessarily be those with the greatest time, which tend to be instructions that were only executed once
but remained active for the duration of the transformation.</p>
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