title: What Is Meant By Server Response Time
body: <p>I'm doing website optimisations using Google's Pagespeed Insights to test improvements. Among the high-priority fix suggestions, is this:</p>
  
  <pre><code>Reduce server response time
  In our test, your server responded in 2.1 seconds.
  </code></pre>
  
  <p>I read the 'helpful' doc linked in this section, and now I'm really confused.</p>
  
  <p>Is the server response time the DNS response, the time to first-byte, or a combination? Is it purely a server-side thing, or could this be affected by, for example, a slow JavaScript resource or <code>ready</code> events in the DOM?</p>