Why does my brand new imac 's fan run consistently when I run parallels?

My Mac seems to have a loud fan sound when I run parallels . However, when I removed parallels off my mac it runs silent . What is going ? Any information would be helpful. Thank you

Hi. Check the link below.
http://reviews.cnet.com/8301-13727_7-20074173-263/dock-using-100-cpu-after-os-x- 10.6.8-update-for-parallels-6-users/
Stedman

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