Anyone noticed there pages load a bit slower depending on what advert is at the top of the page ?

normally my pages always load very quickly but when a certain companys advert is shown the pages takes ages to load or doesnt load at all but only shows the ad at the top . wont say which company it is just in case it starts an argument.

probally just me and my shonky pc, just thought i'd mention it


anyone else noticed this ?