How Can I Measure the CPU Power My Flash Movie Uses?

Hi All,
I'm working on a complex job that is intended to play on low-end PCs so I'm looking at ways to reduce the processor load the movie needs to play. Obviously large screen size, high frame rate, intensive ActionScript, and complex graphics all add greatly to how much CPU power is needed to run a Flash movie, but is there a way of getting an accurate reading of the CPU power it is using? I am modifying a job that was running badly on low-spec PCs so now want to adjust it to run faster and smoother so would like to somehow be able to compare the modified job with the original. Any Idea how I could do this?
Any help would be greatly appreciated.

Hi. I tried your suggestion and I could not get it to work well. In
fact it worked better without the running average (which suprised me).
I also played with the number of data points but still could not get it
to work well.
Do you have any other suggestions on how I could sort this problem out?
I
have attached a screen shot of the signal. To recap, I'm trying to
measure the'y' position of the flat regions of the signal. The signal
does not have a constant level, so this 'y' position varies with time
in a non-unform manner.
I am currently differentiating
the signal and selecting the y position when the differential is equal
to zero (within a tolerance band).
In the screenshot, the
signal has been zeroed using the method I have described above.
However, it occasionally has glitches which may be caused when the code
picks up a zero gradient at a peak or valley in the signal.
I therefore need some kind of algorithm that only measures the position of the flat regions.
Many thanks
 John
Attachments:
screenshot.gif ‏121 KB

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    Do you have any other suggestions on how I could sort this problem out?
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