Try to download a file from here: http://www.magnetmix.com/video.shtml
When you click on the file posted there, you LW client should take over the download. See how fast it downloads........and then post back.
I've the slight feeling that your ISP has started to shape your bandwidth, though till now there was nothing reported about them:
http://www.kitz.co.uk/adsl/caps.htm

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"