Logic cpu meter spike while recording / monitoring?

Hey, I just checked Logic's internal CPU meter, and noticed something quite weird is happening.
I have only ever had one overload message, which I think was caused by changing a BFD2 setting, so the fact Logic believes that it's maxing out one of my cores confuses me a little more.
Anyway, in a template project (just unused audio tracks), if I click the record (or the monitor) button, my first core tops out in Logic's meter, but in the activity monitor, little changes, and sometimes even shows the load changing between cores, with Logic still insisting the overloading core is doing the work.
If I deselect the button, the core returns to no/little load. It doesn't seem to affect Logic's performance, but I'm more than curious about this.
Anyone have the same thing happen to them, or is there a reason for this?
Screenshots are here:
http://i4.photobucket.com/albums/y136/Ed91/Picture1.png
and here:
http://i4.photobucket.com/albums/y136/Ed91/Picture2.png
Thanks, Ed
Message was edited by: Ed Davies
Message was edited by: Ed Davies

From another post of mine:
An observation about lopsided CPU behaviour: a reliable source(an AU and hardware developer) remarked the other day that according to his tests all stuff that is on record enabled/monitored tracks can only run in a single thread using the (small) i/o buffer on one CPU.
This 'real time' CPU can easily be overloaded, while the rest of the CPU's may be idling.
You can have loads and loads of CPU hungry stuff on tracks that are in playback mode(and that use a large buffer because logic knows what is coming) on an octocore, but for record/monitor enabled tracks the octocore is just as good as a single core/cpu machine with the same specs(CPU speed/cache/RAM speed etc.)
Haven't tested this myself yet, but is sounds plausible and it would certainly explain some of the trouble I've seen with CPU overtloads.

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    Version:         9.0.0 (1660.12)
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