Slow burning

i bought a plextor px-750a but its taking me an hour to burn a dvd i’m using windows xp and i have an assus motherboard
i already had this problem with another dvd burner so i think there is something wrong with the pc or with the software
i connected the dvd drive as master
i tried allmost everything even a format but can’t find the problem

DMA is enabled so don’t think this is the problem…

It’s not a matter of DMA being enabled but whether it is actually used…