Certain web pages load slowly

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http://askubuntu.com – Since installing Ubuntu 12.04 (switching from Windows, I'm new to Linux and Ubuntu) certain web pages, especially blog type web pages such as boingboing.net or non-blog pages such as offliberty.com, take 10 to 15 minutes to load. This problem occurs in Firefox, Opera and Chromium. As I mentioned, only some web pages are loading slowly, while 90% of the sites I visit load normally. I have read around and tried fixes such as: sudo dpkg-reconfigure resolvconf This did not solve the problem. Here are some specs on my computer: HP Pavilion dv6-6100, 6 GB RAM, AMD A8-3500M APU with Radeon(tm) H (HowTos)