Dragon Quest viiii Ps2 Iso/pal

Hey guys,

so my dragon quest viiii us and pal version are working very slowly. The music sound is cracking all the time and the loading screens are way to long. I tried to different iso burnd programms (isoburnd and cdburnerxp). But still sound is cracking and long loading screens are still there. I even tried to burn it on 8x speed but the problems are still there.

Sorry for my bad english im frome Germany.