Try the tips here (mainly the first few posts by murasame).
Configuring LW for best performance

You can do a speed test here
http://www.speedtest.net/

Do you mean that your speed in LW is Modem? Do you have a dial-up connection? If so, have a look at Grandpa's guide here.
http://www.gnutellaforums.com/showpo...33&postcount=5