title: Javascript: measure code execution time online
body: <p>I'm experiencing the need to test the performance differences of some variants of code (native/with plugins).</p>
  
  <p>Is there an online service, like jsbin, jsfiddle for execution, where I can put the code in,
  like</p>
  
  <pre><code>// BEGIN
  var bla;
  jQuery.map(bla, function(){});
  // END
  </code></pre>
  
  <p>and get execution time?</p>