title: Is there a way to time script download time separately from execution?
body: <p>I'd like to instrument some timing variables for my main JavaScript load. I could do something like this:</p>
  <pre><code>&lt;script&gt;
    performance.mark('script-start')
  &lt;/script&gt;
  &lt;script src=&quot;something.js&quot;&gt;&lt;/script&gt;
  </code></pre>
  <p>Then somewhere in something.js add a <code>performance.measure('script-start')</code>.</p>
  <p>The problem is that this would time both the script download time and the script parsing and (part of) the execution time. Is there a way to time script download and execution separately?</p>