LW's options would gbe a good place to start.
What have you set as the maximum number of simultaneous dlds (under Downloads) and Upload Bandwidth (under Uploads->Basic)? Also check how many upload slots you have.

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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

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