Image browser for raw Canon cr2 files

I would like to have quick preview of raw cr2 files on my mac. When I was Windows user I've used Irfan View. On a mac I've tried preview but it chokes multiple (200+) high-resolution cr2 files. Can you recommend a program that would enable me to make quick selection of photos (eg. 4 photos out of 200). What would be smooth during browsing such large sets of large images?