http://blyt.net/phxslides/
citez:

Phoenix Slides is a fast full-screen slideshow program/image browser, for flipping through folders or disks full of images. Phoenix Slides also does lossless JPEG transformations and can display EXIF data. It requires Mac OS X 10.3 or later.

daca considerati ca iPhoto este prea lent cand cautati o imagine, probati soft-ul asta open source, care cred ca este cu mult mai rapid, chiar super rapid.
am dat peste el aici : http://www.macitynet.it/macity/aA24232/index.shtml (in italiana)