Feedbacks on OSX: - "Pinch with 2 fingers" on trackpad should zoom, not move to other pictures - I would like to be able to move very quickly from picture to p

Feedbacks on OSX: - "Pinch with 2 fingers" on trackpad should zoom, not move to other pictures - I would like to be able to move very quickly from picture to picture with the right/left arrow (as fast as the Picasa photo viewer on Windows), but I cannot switch to the next photo until the animation is over, therefore I cannot see more than 1 or 2 photo per second (too slow when I want to browse hundreds of photos to find the one I'm looking for).