title: Losslessly compress image as much as Google's PageSpeed Insights
body: <p>I'm optimizing my webpage using Google's PageSpeed Insights. It recommends:</p>
  
  <pre><code>Losslessly compressing http://mysite.com/.../image.jpg?... could save 33.6KiB (23% reduction).
  </code></pre>
  
  <p>However, when I upload this image to Yahoo! Smush.it it's only able to compress it by 8KB, not 33 KB.</p>
  
  <p>What kind of super compresser is Google using? How do I do that?</p>