Still a great app, always one of my first downloads when I set up a new Mac.
As much as I don't want to sound ungrateful, because I'm totally not, I'm going to go into what I'd like out of this app in future. It's an awesome peice of software and when a dev goes to this effort for the good of everyone it's greatly appreciated. I just hope for more improvements to make the app more universally useful.
Firstly this is more a bug, the slideshow speed setting seems locked at 1 second (has been like this for a few revisons), changing the value in preferences doesn't seem to alter the slideshow speed.
Now onto the good stuff.
I run on a 1920x1080 screen, so being able to enable image "scale to fit" in windowed mode would be handy (perhaps with a "do not auto-scale beyond xxx% option) as lower resolution images are quite tiny on my display and I'm often using the program to not only browse photos but images used in development (having +/- zoom control in windowed mode would be nice too). I do work on a linux based cell phone os, typically this involves little buttons, touch screen keyboards, icons etc. all of relatively small resolutions (as would be expected when limited by a pocket sized touch screen). Cocoaslideshow for the most part allows me to quickly flick through these and find the appropriate base item to work on or a revision I'm happy with, but having these auto zoomed in windowed mode would allow detecting differences much faster as by default most of these items take up only a few cm of on screen real estate.
Ability to display animated gifs would also be very handy. It's not a great format I know, but it refuses to die and I'm always needing to work with them. I suspect if that's the case for me, it's the case for others, plus missing support of a relatively common format is always going to stick out like a sore thumb on an app like this.
Once again, great app, and many thanks to the developer, hope my criticism is constructive and not too blunt.