title: Performance testing with JMeter JSR223 sampler
body: <p>I'm doing performance testing with <code>JMeter Python</code> using <code>JSR223</code> sampler. I want to know the following. </p>
  
  <blockquote>
    <ol>
    <li>How to connect to existing browser window?</li>
    <li>How to calculate performance timing?
    Suppose I have 10 steps in <code>Python</code> code. I want to calculate timing from step 3 to step 5.</li>
    <li>How to call methods from one <code>JSR223</code> sampler to another?</li>
    </ol>
  </blockquote>
  
  <p>Kindly help me with it.</p>
  
  <p>Thanks.</p>