Blurry Slideshow

I just upgraded to Aperture 3. I use the slide show to preview portraits with clients. The new version seems very blurry/has poor resolution. I'm using Large RAW images. The images are clear and sharp on my full sceen view but look terrible in the slide show. Any help appreciated.

Aperture uses your previews to generate the slideshow. What are your preview settings in the preferences? I would check that first, and make sure resolution is at least the one that is the longest side of your display (i.e. on my 20" iMac I choose 1680x1680, and Apple has helpfully asterisked the correct choice for me/you).
The next thing to check is that quality is set somewhere north of at least 8. To be honest, I keep my preview quality at 8, and when I want to make a slideshow to preview with people, I set the quality to 10 (or even 12, though not sure that's necessary, I think 12 just bloats the files with no real discernible quality increase). I would then command-click (or select all) the photos in the slideshow, then option-"right click"(or control-option-click) to bring up the menu and select "generate previews".
If it just says "update previews" you haven't held "option" down. "option" changes "update" to "generate". Generate previews forces new previews, whereas just "update" only makes new previews if something has changed in the photo since the last time the preview was made.
This should regenerate the previews for those photos with your new settings and they should look better.
Try those things, and play around with the resolution/quality to find a setting that works best for you.
Hope this helps! Good luck!

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