I've been suffering from this peer connectivity issue too. It was better for a short brief while but came back with a vengeance the other day and has been the same since. Every speed test shows it fine of course but I can literally watch the smallest graphics on some sites load slower than dialup! And it isn't a WA issue either as I'm in MN.
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www.destructoid.com/ is a good example. As is wunderground going slow too. Often times in games I will just lag out for 30 seconds or more inexplicably. Something is still screwy with Comcast's peering with other networks and I'd really love it if they would resolve it.