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In case others are following along. The OP posted a sample epub for me to test with. The images were all png files and all quite reasonable in size although all using 24 bit color which is overkill.
Then there are special fonts that are embedded and used throughout.
And finally there were 3 or 4 chapters in each file.
Once I used Find and Replace to split the files into their natural 13 chapters, one per file, then everything (even with high images and embedded fonts) loaded almost instantly.
So no real justification to make a extra preferences to enable and disable preview updating.
I personally think leaving it as is truly encourages good epub design. But I am willing to be overruled.
If others would be interested in this feature request, please let me know and if there is enough interest I will consider adding it to my "to-do" list for future releases.
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