Check which version of DVD Player you're using. O experienced asudden drop in frame rates when I switched from 2.4 to 2.7 Apparently, 2.7 is software-only. This means that the speed at which the DVD player draws new frames is dependent on how fast your CP is. This is fine for a G4, but a g3 at 400 or 500 mhz is jujst barely able to play DVDs without any background tasks, and does it poorly with other things going on.