var _prum = [['id', '52a79590abe53d5c69000000'],

             ['mark', 'firstbyte', (new Date()).getTime()]];

(function() {

    var s = document.getElementsByTagName('script')[0]

      , p = document.createElement('script');

    p.async = 'async';

    p.src = '//rum-static.pingdom.net/prum.min.js';

    s.parentNode.insertBefore(p, s);

})();

• load in an iframe hosted on limelight
• create iframe on ad call