Since I got my new Asus A7V266-E RAID motherboard, system gets extremely slow when burning CDs (when I type something it takes 15-20 seconds to appear, switching between programs or scrolling takes as long).

My mobo has 4 IDE channels (2 RAID connectors set to normal IDE mode):
Primary master: 40GB ATA100 hard drive (c
Secondary master: 30GB Tape drive (t
Third master: CDRW
Fourth master: DVD ROM

What is causing this?

Thanks