title: Simulate loading on localhost
body: <p>I have a site which uses AJAX and preloaders. Now I would like to see the impact of these preoloaders before deploying the site online.</p>
  
  <p>The "problem" is that localhost doesn't have loading time and the response is immediate, so that I can't see my preloaders.</p>
  
  <p>How can I simulate loading or limited bandwidth (with Firefox, Rails or whatever else)?</p>