Change swf loading text duration

That text displays for the amount of time that it takes to load the first three slides. If you make the first three slides larger in file size (add large graphics or video content) then it will have the loading screen display longer. You could also create your own 'loading' screen as the first slide in the presentation and then you would be able to dictate the durration of that slide based on the amount of silence or audio that you place on that slide.