You mentioned RAM; but what about scratch disk space? Just curious because a lot of the rendering and preview is relying on scratch rather then RAM which is used to operate the programs. I would be interested to learn more about your workflow. For instance, image resolution and color space. I understand that it used to work on the previous hardware and now it does not. Are you in 24 or 32bit? It seems there is something hardware related that does not match your previous MacBook Pro. And, perhaps the version of Illustrator. If you can, see if the Illustrator Preferences of both machines match. It may be something small that now does not match. Because you are dealing with grand format files, often those files can be scaled down to make them more manageable. For instance, scale to 25% with placed files at 300ppi ( final image res equals 75ppi, more than enough for large wraps, etc. ). If you are using 300ppi image files at actual size ( 100% ), then things could go awry.
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