sorry u meant 40Kbytes/s i am really sorry..... well if there are no ppl in the lan and still your downloading sucks in any server or website you are trying to download from? check the port configuration in your firewall and check for any trojans that may affect it....
furthermore 50 ppl in the lan seems to me as a bysiness, most probably the administrator of the lan closed all the downloading ports. it must be something to do with ports either configuration or trojans. and yes there is a way to allow surfing being normally fast but downloading virtually zero, it's all a matter of ports opened or closed, usually done by firewalls and trojans.
The last thing is the ISP filters but it's very unlikely the ISP done so much of filtering, they do it but not to such an extend. they may restrict for example p2p downloading (like my employers) or restric both browsing and p2p in a balanced way to make sure there is enough bandwidth for everybody, but never to such an extend.
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