I get much better results (using Gnotella - all the other clients I tried lacked one or more essential functions available in Gnotella) when allowing a maximum of two or three connections and a max. of 4 Uploads. Even with these restrictions after a few hours my memory is totally filled, connection speed falls and my system acts like an old 486. It's then getting better if I cancel all the search connections and only keep the up- and downloads alive. Some people had the luck to leech from my hd with speeds of 100-200K/s, and I also had the chance of leeching files that fast from others once or twice - but mostly the speed crawls around 5-10K/s even if the other claims to have a T1 connection.