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Approaches for 20fps full-screen arbitrary images

I'm about to embark on an installation for a gallery that will allow users to sit down at a Mac and browse through a database of about 900 full-screen (1024x768) images. That's about 2.25gb of uncompressed bitmaps, or 270mb of compressed jpegs.

I'd like users to be able to "flip" through the images very rapidly, so that by moving the mouse the images change at 20fps or faster. Like flipping the pages of a paperback, you stop when something catches your eye.

The images will be sequenced in many different ways: the user can flip through in alphabetical order, in order by category, etc. So, Quicktime isn't an solution I don't think.

I now need to spec the computer which will be in the gallery and purchase one for development purposes. I need to decide how much RAM to get and what video card. Does anyone have suggestions about the following performance questions:

The images could be stored on the local disk either compressed or uncompressed, whichever works better.

1) Is a 1.8ghz G5 fast enough to load and display 1024x768 images one at a time from disk at 20fps?

2) If not, and all the images must be preloaded into RAM, then could they be stored in RAM compressed (as jpeg data) or must they be stored uncompressed in RAM (at 2.5mb apiece) in order to achieve 20fps?

And finally, this will be my first programming project of this nature, my previous experience is for the web. I have plenty of time and am trying to take it one piece at a time, but any pointers would be appreciated.

Dan

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