slow loading times what cause?

What is exactly causing slow loading times? I have a couple of slides that have a lot of layers, triggers, .png and objects.

To jump from 1 slide to another is about 5s. 

I deleted nearly every PNG and object and layer, and there is only 2 button remaining on 2 slides, that point to each other. however, loading time is still 5s. How is this possible

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