Just wondering if it's me, or my setup or what?!

Virtually everytime I go to the Tesco Direct website, it really slows down the macbook. After browsing around, everytime a page is loaded, it seems to sit waiting for about a minute or two, whilst the beachball spinner just sits there spinning. Finally it will stop, and I can access the site again.

Just wondered whether it was my macbook pro, or whether it's some script or something running on the site?! I do get the beachballs now and again, but this seems to constantly bring them up...

Cheers guys