internet ridiculously slow on Ubuntu where as its very fast on Windows 7 in the same machine

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http://askubuntu.com – I recently installed Ubuntu in my machine which already has Windows 7. Internet pages load really fast when I boot Windows 7, but its very very slow and sometimes wont even load in Ubuntu 12.04 LTS. I tried several solutions mentioned online but nothing works. My settings use IPV4 not IPV6. Please help. (HowTos)