Difference is, that MDW does'nt put tracks into RAM during runtime (gains much RAM). Can imagine, that loading from HD is'nt quick enough in some conditions (HD startup after ideling, etc.). Depends on your backgroundtasks too.

As I wrote above: Even on EFIKA it runs perfect without any stuttering. For such a small machine with a really low-speed-ide, its amazing - compared to Morphoza, which has a part where EFIKA broke down to 3 fp/s (Part 4 greetz).
To be complete: Morphobia runs perfect and Morphilia only without startup-sequence (leak of RAM)