I just finished building a new computer (asus p8z77-v deluxe MB - 32GB mem - I7 3770k CPU - Geforce Classified gtx580 vid card - Crucial m4 256GB SSD drive.
I installed windows 7 ultimate 64bit ( fresh) and I have a great Roadrunner connection via lan but I still get very slow browser loads on many pages. if I go on my daughters laptop which is wireless on our network those exact same pages load instantly so i am ruling out my internet connection.
For the life of me I have NOT been able to figure out why many sites time out, load slow etc. This is on IE, Fire fox as well as Chrome. Hope somebody can help and thanks in advance.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic