RealPix bandwidth math is now incredibly easy. One of my personal RealPix frustrations is preparing the images. RealSlideshow comes with a built-in image editor. You can crop your images or, my favorite feature, adjust the compression with a slider. The actual projected download time and and image preview is displayed to help you with your choices.
Transitions are just as easy.
Choose a transition style, a duration, and hit the play button. The preview shows you what to expect. Narration and Background Music RealSlideshow rounds out its feature set with a built in narration recorder. Plug in a microphone, load up a slide, and hit record. RealSlideshow keeps track of the generated WAV file for eventual conversion to streaming media when you publish.