When just starting, limewire runs fine. After about 30 minutes it's getting really slow and starts eating up (too much of) my system performance. I just have a new system, Pentium 4, 1Gb of memory (Dual channel), and 2 SATA harddisks. Fast enough I should say. Problem might be I'm sharing a lot of files (about 25Gb of music) and a similar amount of other stuff, but thats what limewire is all about, isn't it?