Ah, that's probably what's happening. I haven't burned any CDs from MP3s with my Lite-On yet, but burning straight from WAVs and data CDs takes about 4:40 with 650Megs, and 5:10 with 700Megs. MP3 decoding shouldn't take so long, though. Have you watched the entire process, and seen any dips in the buffer? If so, the "BURN proof" feature could make it take that long.