Do a speed test & tell us the results
http://www.speedtest.net/

Download a file from here & see what kind of speed you get
http://www.magnetmix.com/video.shtml

What are your details?
System details - help us to help you

This sticky has some good tips (mainly the first few posts by murasame) about how to set up LW for best performance.
Configuring LW for best performance