Behavior after Power Down and Back On

One utility I have installed on my 3GS is System Activity Monitor. It shows several things, including CPU activity and which processes are active. More CPU activity should mean faster battery drain.
I started watching CPU activity a couple of days ago. One pattern I've seen is that if I power down with the top button, and then back up, the CPU idle percentage starts quite low, around 30% -- meaning that the CPU is quite active. The idle time quickly rises to the neighborhood of 70-80% and then slowly increases to around 98% -- which I take to mean low battery drain.
Earlier today I did a Reset to see if that made a difference. It did not: Initial idle time was again quite low in the 30% range.
I can draw no conclusions from this .. though I will ask my friend the iPhone developer about it, since it does not seem conducive to long battery life.
Phil

Right, what I meant is, you are saying that your only at 30% idle when it wakes up from sleep, meaning CPU usage is at 70% its powering itself up from sleep, it will use quite alot of power to do this. hence when it ends up at 98% its just waking up from sleep.You will see the same thing when you are powering down a computer, when you get the "logging off or shutting down" screen CPU usage goes way up.
I think were on the same page here

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Behavior after Power Down and Back On

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