I'm using latest 3 at the moment. It has memory leaks(cache size is 2048, uTorrent eats more than 5 Gig of my RAM, but that memory is not assigned to uTorrent process). After restarting(force killing process) uTorrent memory usage grows slowly (~3 gigs per 8 hours). My hardware & soft: CPU:Phenom II (4 cores@2.6Ghz) RAM: 8Gb HDD: 3x(160Gb)SATAII(RAID0) OS:Win7 x64 Enterprise