welcome to the board, betoranaldi!
as for yoyoman, apple says:
Optional SuperDrive (DVD-R/CD-RW); writes DVD-R discs at 1x speed; reads DVDs at 8x speed; writes CD-R discs at 8x speed; writes CD-RW discs at 4x speed; reads CDs at 24x speed (12-inch model)
So I don't know what you did to burn your CD faster.