With dual-core systems common these days and quad-core systems around the corner, making DVDFab multi-threaded on the first pass on a high quality encode would help a lot. Running on a dual processor dual core Opteron system only one CPU is maxed out. The second pass seems to spread the load better, though it is still fairly asymmetric and neither the CPU nor the DVD-ROM is maxed out, not sure where the problem is there.