That doesn't sound good at all!!! It could well be an isp secretly shaping p2p bandwidth use. Do a speed test whilst LW is closed & post your results.
Here's some to try (try more than one):
1. Choose nearest location for a speed test & only have your browser open:
http://www.t1shopper.com/tools/speedtest/
2.
http://specials.zdnet.co.uk/misc/ban...eedtest50.html
3.
http://www.adslguide.org.uk/tools/speedtest.asp
4.
http://www.broadbandreports.com/stest
*** Who is your ISP (Internet Service Provider)?
(BTW some of these tests quote speeds in kbps & not KB/s. So divide the figure by 8 to get KB/s)