I recognize this effect with a lot of websites, namely google maps, most fancy/designed web 2.0 startup websites (those that like to display a lot layers using

I recognize this effect with a lot of websites, namely google maps, most fancy/designed web 2.0 startup websites (those that like to display a lot layers using CSS that change their position when scrolling... don't know how this is called) My guess would be inappropriate or too much JavaScript or other stuff that blocks execution of JavaScript, maybe some kind of plugin that is beeing initialized.