When visiting your plugin page, I had to wait over 30 seconds while bdv.bivertizer.com loaded its content. This is one typical problem that is a plague on ad serving, having to wait for external servers.
IT would be very useful if someone would make a plugin that looked at page load to see if the ad server is delayed for 'x' seconds, if so defer the ad function till after wordpress page load.
The logic is simple. you have more chance of serving an ad on a site that loads fast, even if the ad is loaded after the main content. Ad servers should never slow the site down.