Is it normal for 10-20% cpu to be used when idle and watching activity monitor?

Is it normal for 10-20% cpu to be used when idle and watching activity monitor?
I have a macbook 6,1, 4gb of ram, and my os seems to be spinning the rainbow quite often and laggy. I watch my activity monitor and it never drops below 90% cpu available. Is this normal? if not what can I do to clean up my os. Does anyone have any resources or help? Thanks

Hello:
Answer - no.
The activity monitor should indicate what is consuming the processor when your system is idle. 
I just looked at my own system with Safari running and the usage is about 3%.
Barry

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    I don't know maybe I'm just expecting too much or it might just be what I think it is, anyway if anyone has experience this issue, feel free to share your point of views or past similar experience. Thanks.

    Yes.. It's been a while, but I remember thinking the same thing!
    Below are a couple of other links where folks reported the same thing!
    http://discussions.apple.com/thread.jspa?messageID=5755300&#5755300
    http://discussions.apple.com/thread.jspa?messageID=6552175&#6552175

  • CS5 12.0.4 CPU use when idle.

    12.0.4 has caused Photoshop CS5 to use approximately 15% of CPU under OS X 10.6.7, even when no documents are open. I haven't made any changes to my system save for the update. As I need Photoshop to be open often while I just look at a couple of photos for awhile, I'd like this to stop: it's wasteful.
    Since I know there's a history of problems with Snow Leopard and fonts and Photoshop, I decativated all fonts as a test: no dice.

    There's another topic here on the same problem.  We have no idea why it might be happening, and haven't seen it ourselves.
    I just posted instructions in the other topic on how to get a time sample of the running app and try to get more information about where the time is being spent.

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