Do a speed test & tell us the results.
Speedtest.net - The Global Broadband Speed Test

Download a file from here & see what kind of speeds you get.
Magnetmix

Have a look here & try the tips from murasame (first few posts).
A few things to consider while configuring Limewire for optimal performance...

Give us your system details.
System details - help us to help you -> Provide these details when you post!!!(click on link)