I know the question has been asked before in a more general way Best image viewers for windows and i agree with the answers. But Irfanview and others have something important lacking: pre-fetching of the next slideshow image in memory. Did I miss this option in Irfanview?
it is very annoying with todays 4-5 Megs hi-res images to have to wait about 1 second until the next image in a slideshow is loaded. esp. when viewing them directly from slow CF cards, it can take 5+ seconds.
What image viewer has this feature?