I found a way to reduce Vista CPU usage
 

I just discovered that by changing the Start -> Control Panel -> Power Options in Vista Enterprise (running under build 3150), I was able to reduce the CPU consumption from 37-40% to about 17-20%.

By default, the Power Options setting was Balanced, but I changed it to Power Saver, and CPU usage went down quite a bit. You might also reduce it further by changing the search indexer behavior under the Advanced Settings when you Edit Plan Settings.

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Can you please post this in the howto forum.
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Can anyone else verify this?

[QUOTE=constant].
Can you please post this in the howto forum.
.[/QUOTE]
It probably should be there once it is confirmed to work for more than just me.

[QUOTE=neosublime]Can anyone else verify this?[/QUOTE]
I can confirm that setting the energy settings to Powersaver and disabling any unneeded services brought my parallels cpu from 120% to around 15% :D:D

[QUOTE=doggkruse]I can confirm that setting the energy settings to Powersaver and disabling any unneeded services brought my parallels cpu from 120% to around 15% :D:D[/QUOTE]

What services did you disable can you please post?

Yes, I can confirm that this works well. My control panel is set up slightly differently so to get to the option described by feuerri I had to go Start -> Control Panel -> System and Maintenance -> Power Options.