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Originally Posted by willshcj
If I connect to almost any USA site to download a file, the best average download speed I can get is about 20K bytes/second at any time day or night.
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This sounds as if you need to increase the RWIN setting on your network interface. The longer the end-to-end latency, the larger RWIN needs to be to maintain full throughput. This would explain why you get better throughput from UK sites (low latency) than US sites (with higher latency). Adjusting RWIN is best done by downloading DrTCP from
http://www.broadbandreports.com/drtcp.
The QoS features of XP will not help with this problem: they only apply to bandwidth reservation on your network interface for QoS-aware applications, and (a) I'm guessing your applications are not QoS-aware (very few are), and (b) the problem is not a shortage of bandwidth on your network interface, which runs at ethernet speeds.