5000 frame project renders fast at first... then... slooooows.... down.

Maybe you guys can help me with this. I have a single ProRes 4444 Quicktime movie in a comp. No effects, no scaling. Just re-rendering the Quicktime to another ProRes 422 Quicktime. It's about 5000 frames @ 1600x1200.
So it starts of blazingly fast. The Est Remains shows 3 minutes! Yay!
Then about 1/3 into it... the...render..... starts....to .... slow..... down....
About the half way point, Est Remains: 14 minutes! Boo!
What's going on? Why is AE slowing down on a pure no effect, no compositing render? How can I fix it?
Snow Leopard 10.6.2/AE CS4 9.0.2 /16GB RAM/Mac Pro (Late 2008)

I totally agree, Szalam. But this was a test of AE. I noticed that my actual project with effects and layers 'n junk was getting progressively slower as the render went on. Even the though the effects & number of layers remained fairly consistent (in fact, there were actually fewer effects and layers in the later part of the project, but the estimated time kept growing and growing.)
Todd, yes using 6 CPUs, I have enough memory for 2.27GB/CPU and 2GB left for other apps. I agree 14 minutes isn't bad. But when it screams through the first few hundred frames in seconds and then...starts.... to... chug.... and... get....slow... I get the Spock raised eyebrow expression . And the fact that it stayed at "Est Complete: 14 minutes" for 15 minutes really makes me start pulling my hair out in large clumps.
I was thinking maybe I could break it up into segments? Render 1000 frames in one queue, another 1000, etc. Give it a chance to do clear its mental constipation by doing whatever internal purge it does when finishing one render and starting another? Does AE kinda fart out at really long renders?
You know the inner workings far better than I!
(And how's this gonna work with 64-bit? Each process can have have petabytes!)

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5000 frame project renders fast at first... then... slooooows.... down.

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