I guess you already know, but Gnotella is, especially after a few hours of uptime - able to consume all my system's memory and giving the cpu a constant load of 100%. This is especially the case while having a few (never more than 4 anyways!) search connections running (up and downloads seem to be less of a problem). The whole thing is sometimes getting so slow that I have to wait a few seconds before pressing a button in Gnotella has any effect and in these few seconds the connection speed is dropping heavily.