intensedebate performance impact?

intensedebate looks great (esp. twitter/facebook integration), but typically javascript-based solutions (esp. is javascript is not loaded asynchronously) do have a performance-impact on page loading/ rendering.

hence my question:
* how many extra files (javascript and other) are loaded? how big are these? from how many sources are they loaded?

and as a bonus:
* quantcast-tracking (as in “behavioral marketing”) seems to be included, can that be turned off?