Me thinks you must find a way to communicate with your ISP and ask them if they are choking P2P. You can try asking friends or other people who you know are using the same ISP as you and (possibly) also LW or some other P2P app, but the info will be less reliable unless they really know what they are talking about.

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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-