If your actual speeds are way lower than your advertised ones, you could download Cablenut from
http://www.cablenut.com and Van Buren's v2 settings from here -
http://testmy.net/topic-1013 and try
TCP Optimizer as well. Choose the best of Van Buren's settings that fits your connection type and MSS value which you can figure out by visiting the TCP Analyzer website here -
http://www.[this.site.has.been.blocked.for.spamming]/analyzer.php . Also make sure you have a virus and spyware free pc as those nasties can slow down your connection too. Hope this helps ;)