AECS3 rendering out choppy footage

i have a short quicktime movie i edited and put some effects in AE, it was shot at 24pn, but when i render it out it plays choppy....i'm on an intel mac using leopard, the .mov file is only 640x360, looks like the bit rate is at 8 on the composition and the resolution is set to auto
i notice it plays choppy on ram preview (which i assumed was supposed to do that anyway) and renders out exactly the same way.
my last mac was almost 2GHZ slower and spit out these files just fine.
quality and audio are perfect.
can someone help?

i have AECS3...whats an unqualified version of an intel Mac??? what is Rosetta??
i downloaded a couple of mov files form apple and it plays fine.
also a friend took the same mov file i'm having trouble with and he said he had no issues, he's on a PC version of AECS3
could it be the way the video is encoded? i noticed when i tried to convert the same mov files to an flv using flash cs3 video encoder it plays choppy as well

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Message was edited by: JD Marlow

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At the top of the Help menu is a document called Release Notes.
This behaviour is written within. You will save yourself a world of grief if you read the Release Notes.
Also, as a new reader to the forum, welcome, however, there's a Search function that you should use.
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AECS3 rendering out choppy footage

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