No. Flash itself is poorly coded for the mac. Grooveshark is currently in the background, not playing anything. On my work PC, running XP, it doesn't use any c

No. Flash itself is poorly coded for the mac. Grooveshark is currently in the background, not playing anything. On my work PC, running XP, it doesn't use any cpu at all. On my personal mac, it constantly hovers at 45% core usage, meaning if I open grooveshark at home, my fans kick on in a 60 degree room.