Thanks to Google Analytics, the web is slowing down...
When you click on a link and the web page doesn't load fast, or does not finish to load, then look at the bottom of your browser (you must activate the Status Bar) and you will find:
While very useful, this service could cause undesired slowdown in loading pages. Worse enough, if you put the script at the beginning of the page, the page won't load until Google Analytics has recorded the information.
So please, put it at the end of the page! :-)