New Parallels, Still Using CPU When Idle

We now have a new version of Parallels (released September 11, 2007). The list of improvements includes "Superior Performance and Lower Overhead", so I expected that this new version of Parallels wouldn't use 7% of my CPU when all the applications it runs are just idle. But unfortunately that didn't change. Am I doing something wrong? Somehow I have a hard time accepting Parallels just needs to use close to 10% of the CPU cycles when none of the applications executed by Parallels take a significant amount of CPU.