I've wrapped up the NProgress JavaScript library into a new dynamic action plug-in compatible with APEX 4.2 and above. It provides a minimalistic loading indicator for your page.

It is the same loading indicator that is used on this very site (red bar at the top) and is well suited to AJAX applications.

nprogress

Check it out over at the new https://apex.world community hub or at my github page https://github.com/drumbeg/apex-nprogress.