The host may just have a slow speed, they might have too many upload slots open, their LW just might not be set up for optimum performance... there are a few factors that come into it.

Is your LW set up to work at it's best? There are some good tips here
http://www.gnutellaforums.com/showth...threadid=27036

You could always try chatting but remember... you've gotta have chat enabled too & it's not very reliable at the best of times