title: What are Parse, Compile and Evaluate in DevTools Performance tool?
body: <p>When running JS scripts in Chromes' Performance tab, I see there are three steps for JS interpretation: <code>Parse</code>, <code>Compile</code> and <code>Evaluate</code>.
  Sometimes I just see <code>Evaluate</code>, sometimes <code>Compile</code> and <code>Evaluate</code> and sometimes it's the whole three.</p>
  
  <p>My questions are:</p>
  
  <ul>
  <li>What each step actually means?</li>
  <li>Why sometimes there are missing steps? (for instance, sometimes <code>Parse</code> is missing)</li>
  </ul>