Should I Reduce the Number of Images in Each Slide?

I have a presentation that, because I'm a photographer, uses dissolves to transition between around 400 separate TIFFS, each around 7MB. The show hiccups, especially between heavily loaded slides. Is it better management of the app to put each image on a slide, and dissolve from one to another, instead of doing thirty or forty builds in each slide?
Also, is it just me, or do the images soften considerably as I reduce their size on the screen? Should they be sized in CS3 for EXACTLY their final show size at 72dpi?
Thanks from a Rank Newbee!

My guess is that Keynote would prefer separate slides for separate images. Also, reducing your images should help performance enormously -- I would strongly recommend resizing them before pulling them into Keynote.

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