Parallels Desktop - what is the speed impact?

My fuzzy impression (no numbers to confirm this) is that instead of the Mac being a full-blazing 2.33 GHz machine it maybe slows down to like a 1.8 - 1.9 GHz machine when a Windows XP VM is running in Parallels Desktop.
When I suspend the VM things speed right up again.
Is that other peoples' impressions too?
Thanks,
doug

Yea I have noticed similar behaviour. Actually not just with parallels but everything. When i boot up my free ram is around 1.7GB (out of 2GB)... even if I dont touch parellels but instead launch mail, aftereffects, skype, firefox etc... and then close everything down I still only have 1GB ram free!!
I dont really know much about mac osx memory management but I think it might be something to do with the 'inactive' memory. From what I understand this is memory which is no longer needed (potentially its free), but the system keeps it reserved but as 'inactive' in case the application is launched again and needs it - so it launches and inits quicker. If a new application needs memory and there is no actual 'free' ram then the system uses the 'inactive' ram for the new app. - If I have understood it correctly its all pretty smart!!
So basically the amount of ram available to your applications is the sum of 'free' and 'inactive'... and if you add the two together I think you'll find that you are back up to where you were before you launched parallels.
http://docs.info.apple.com/article.html?artnum=107918
P.S. more detail on my prev note about parallels: If you have your VM set to use 1GB of RAM, you'll see that is directly allocated in your systems 'wired' memory - even if you are running nothing in your VM, 1GB is allocated from your physical ram and cannot be swapped, so your mac apps will always suffer 1Gb less of physical ram. If you change the option i mention about disk caching thisll probably change.
MacBook Pro C2D 17" Mac OS X (10.4.8) Week 46 Build

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