pace
An automatic web page progress bar.
Include pace.js and a theme of your choice to your page and you are done!
We also have a Wordpress Plugin.
Pace will automatically monitor your Ajax requests, event loop lag, document ready state and elements on your page to decide on the progress.
If you use AMD or Browserify, require pace.js and call pace.start() as early in the loading process as is possible.
Demo
Documentation
Example
<head>
<script src="/pace/pace.js"></script>
<link href="/pace/themes/pace-theme-barber-shop.css" rel="stylesheet" />
</head>