Firstly you will need to open a port in your router for limewire, so you will have to port forward...
These are your instructions...
Port Forwarding for the Linksys WAG54GS
Also make sure you have allowed limewire in your Live Onecare ...
Another thing is your ISP, they do shape bandwidth during peak times..
::. Kitz - ISP Caps, FUPs and Prices .::