Is there a maximum viewport size for an EPUB file in iBooks?

I have noticed that very large viewports sometimes cause iBooks to crash. Is there a maximum size allowed?
thanks,
Liz

The viewport size I use is 512px wide by 768px high for my individual .xhtml pages.  For a two-page spread this would mean the viewport is actually 1024px by 768px.
Yet I paint my original images for a Children's Read Aloud Fixed Layout ePub at 2048px wide by 1536px high and then cut the painting in half for a two page spread.  This means on the new retina display, my images will look great yet be backward compatible with the original iPad.

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