Larger image size and disk performance

hey all,
Granted the majority of users here won't experience issues with larger image sizes, but i'm hoping a few may be able to shed some experience.
I work with a H3D, Mamiya RB (with various Leaf backs) and also drum scanned film. The issue is that often a single image size can be anything from 150mb upto 500mb, this is excluding any post production changes.
My current aperture library is on a FW800 disk, but disk i/o is crippling the box and program at the moment. I'm looking at the express slot and wondering who here is running a disk off that and what they feel it's like from a performance perspective.
An example is a recent location shoot which has a handful of images above 500mb each. Aperture takes around 10-15 mins to startup when this folder is selected (constantly processing the image every time it starts) and this leads to a totally unresponsive OS.
How are you handling large files with Aperture?
Mac OS X (10.3.9)

On the Quad I process 250Mb+ TIF scans, not often, but often enough. External drives 7200rpm in a Sonnet 500P encl. attached to eSATA muliport card (Sonnet E2P). Performance is equal to internal so far as I can judge.
I recall the PCMCIA then PC Card bus speed was horrendously slow. Not sure what the Expresscard bus speed is, but it would be a crying shame to attach 300Gb/s burst capable drives (or RAID 5 driving 200Mb+ continuous) to a backend bus capable of a few Mb.
As Alan notes, a MBP may be OK for field work and tethered shooting, but for the image sizes you have, the preferred solution would be a Mac Pro.
G.

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Larger image size and disk performance

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