Many posters at the site saying about the same thing. It is the auto start for the videos which slows things down. It is an easy web fix for them not to do that but they still do. Yahoo is another site that does this.
Adblock Plus really helps alot and get Flashblock for the videos. Drag the button unto the Firefox toolbar from customize and with 1 click either turn on or off Flash!
See my post #10 re: uBlock Origine
Does Flashblock prevent autoplay of videos?