Toast 11 was great, only the speed of encoding seemed lacking, at least on my Mac system. Toast 12's encoding speed seemed to increase manyfold. I figured Roxio was taking advantage of the hyper-threading capabilities, however all Dvd's burnt stutter. I went back to Toast 11 and burnt the same movie and it ran smoothly. This occurs on all video files mkv, mp4, avi's and mov's. Something is definitely amiss in the new version of Toast.