Loupe view caching- not even two images?

Is there a way to adjust how many previews are kept in RAM for the loupe?
I've found that most of the time I can't even bounce between two images without waiting for several seconds for the image in the loupe to appear. This is on a first-generation macbook pro with 2GB of ram, no other open applications, and 20GB of disk space free (and just defragmented.) The preview quality slider is set to the middle position. I shoot exclusively in RAW and upgraded recently from a 10D to a 40D; I'm guessing that Aperture only allocates a fixed amount of memory to storing previously viewed images, and the larger 40D images are too big for the default settings.
Sometimes I can go through three images without seeing the "loading" prompt; other times, I hit the arrow keys back and forth between two images, not even moving the mouse to compare two shots, and see "Loading..." for long enough that I can't make a visual comparison between the two images for finer detail. In one word: useless.
Is this a restriction of VRAM? System memory? Graphics processor in the original MBP? Pure "policy" in software, ie, "we will use 40MB of memory to cache previews"? Anything that can be changed via 'defaults'?

Janet,
The loupe is "smooth" panning around the image (except after more than 1-2 adjustments are applied, then it rapidly deteriorates.) The issue is switching between two photos rapidly to compare details such as "who's looking which way" and "what is in focus." I can sit for 20 seconds or more flipping between two images next to each other in the strip, and each time "Loading..." will appear and the loupe will be blank.
I just tested it on a Core2 MBP (2.3ghz, 2GB), and received different behavior. The "loading" delay happens once or maybe twice, then I can repeatedly swap between two images with no "Loading", but two is the limit- seeking to a third causes the first image to drop out of the 'cache'. The newer system has only about ten photos in it; the older system has almost 20GB of 10D images and another ~2-3GB of 40D images. I'm not entirely sure how valid the comparison is, then.
Both systems have 256MB of VRAM, and both are the Radeon X1600 (which is curious- I expected the Core2 machine to have a newer card. I guess it's one of the very early Core2 machines. I wonder if they simply bumped up the clock speed- the original MBP's X1600 was intentionally downgraded by Apple in clockspeed.)
I'm not using sRGB space- I shoot everything raw and have always set my cameras for Adobe RGB. I'm not a new user of Aperture, so I'm aware of thumbnail/preview building etc. I've tinkered with it on other people's machines since v1. I've never witnessed an Aperture crash, but I've only played maybe once or twice a month.
I've also noticed the quality of display in the main viewer window to be exceptionally poor with images from the 40D; it seems very fuzzy, and almost like it's up-sampled from a low resolution version. Sharp edges are very oddly (and poorly) aliased; almost like Aperture is using the preview image from the camera, instead of building its own.
Another thing: sharpness on exported JPEGs, both full size and scaled down,seems downright lousy. Odd...a couple of versions ago, they were too sharp, it seemed.

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