well 16x is what my disks are rated at, burn at that speed. i had smg burnt at 4, 1, and now 16. it froze a lot at 4x, froze a little at 1x, and i just got 105th star at 16x! 1x was playable but froze on the certain star i was trying to get.
EDIT: it just froze on the screen "The game has been...