Sure it takes 5 secs to dld something big: when in LAN, it's virtually as if you were using the same computer with the other user.
Anyways, well, I heard that you can loose a lot of speed if you use a wireless.

If it's not too much trouble (I bet it is...), try reconnecting the cables. See if you get the stars there (I bet you will...)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-