My itunes visualizer on my G5 1.8GHz Tower pauses in Tiger 10.4.4 with 512mb of ram. Limiting the frame rate does not solve the problem. I've had this problem out of the box when I got this Macintosh last March. Ironically, my old 7 year old iMac (version B) running 128mb of ram, OS X Server 10.3 does not pause and runs perfectly. Does this makes sense? What hardware and/or software process does a G5 Mac run that causes the itunes visualizer to pause every few seconds? Apple Tech support was no help when I mentioned this problem to them last year.