I don' t know if what i' m going to say can help you or not, but here it goes:
You say your connection is throgh LAN; how many users has that network? for example, if there are 50 users "surfing" the net, the bandwidth will be divided by all the users.
if there are only a couple of users, there might be a limitation somewhere, perhaps at the LAN administrator or at the router, in order to keep some bandwidth free.
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