I don't have Windows, and use Linux, but I can certainly see the same issue, though I don't have visible slowdown.
http://i.imgur.com/nWWN6Xw.png
It appears to be the ads, it keeps refreshing the page every few seconds, pulling more data. If I click and hold on the back button, it's flooded with Videokarma, even though I only went to the home page, and stayed there, not following any trail.
With that, the issue is entirely with rogue advertisements (which I'm sorry, is why I use an adblocker. I simply don't trust these ad providers anymore).