I’m confused

Is Composer's 'Preview' mode a true representation of what a Composer book will be in its final, published, App form?

To me, the Preview mode seems a bit slower than what a final, published App would be, such as 'Astrojammies.' Is this because Astrojammies is in its own contained memory space as a standalone App? And is it because the Preview mode is connected to the Composer App, while it is open? I also notice that animations sometimes drag before they finally work at the correct FPS— is this because the iPad has to load it into the memory and cache for it to work speedily? Or is this just because I am in Preview mode?
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