I can stick my oar in here and say it idles at about 5%, if that on my Windows 7 PC running a Core2Duo 2.8GHz CPU.
Also, on a Intel Celeron 1.9GHz CPU (what is originally a) Dell Windows laptop running Mac OSX 10.6.7, I'm idling at about 5-10%, if that.
Therefore, if it's happening on Macs, seems to be linked to Apple hardware rather than the OS as OSX runs it fine on my Dell laptop, even with a cruddy old 1.9GHz Intel Celeron M CPU.
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