As I've already told you, maybe the best thing would be to wait for Limewire to establish a better connection to the network: I used to be Turbo-charged, now I'm Excellent (but it goes from Good to Turbo randomly); it doesn't affect dld speeds.
Anyway, be advised that Cable connections are affected by the physical distance from the server: if the server is too far away, then speeds can be bad.
Also, firewalls and stuff like that? Have any?

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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-