It sounds as if your system is in need of upgrading. I imagine that the software that you use to encode the video with plays a determining factor also. I use a 3 gig P4 with 1 gig of dual channel DDR 4000 memory and several different applications to actually encode with, one of which is Sonic DVD Architect....it usually cranks out 4 gigs of DVD compliant data in under 2 hours. If youre Mac die-hard, then try to go all out and get the G5 if it is within your budget