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You have way too little RAM and, which contributes to general performance issues, you are using an asymmetrical allocation. All coreXi processors have 3 memory channels and if they are unbalanced, the processor runs in quirks mode, essentially. 6GB would be the minimum, 12 GB is better, obviously.
So, more ram would give me a good boost in render-times?
How long does it take to render a similar composition on your computer?
As has previously been mentioned, this very well may have to do with your codec. I've seen huge speed increases when I stopped using codecs that use interframe compression. Dave LaRonde from CreativeCOW.net has talked about this so much that the following is now known as Dave's Stock Answer #1:
If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, mp4, m2t, H.261 or H.264 -- you need to convert it to a different codec.
These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.
In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.