Just to put some perspective on it dude.
My hardware is a similar set up and LW is one of the less problematic programs I run on my pc, on a regular basis...it's puzzling.

I suspect the proble lies outside of LW for most people maybe java, machine infection, or isp interference - maybe try another p2p prog? - personally lw has been the best for me. It's a jungle out there so it's been said, esp. with p2p-ing.

Patience, grit and experimentation