Some advice here, including increasing the number of HTTP connections. Don't go over their suggested limit. It already violates internet protocols, and if you use too many, the site may refuse a connection. So do what they say.
http://www.speedguide.net/read_articles.php?id=2448
Hard to say when congestion is going to be high. The Asians are just getting into the evening, remember. School just got out a short while ago.
You might try the TCP Analyzer and Optimizer on that site, too. Though XP and Vista change their settings dynamically and that is usually the fastest, sometimes a manual setting actually works better. I about doubled my speed with some settings changes because PPPOE is not one of the more common connection types and the optimal MTU was never set.