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I've only investigated it a little, but yes, it's a known fact that the new viewer takes several seconds to open the first time it opens a file.
Subsequent opens of the same file are quicker, even after restarting Calibre. That suggests that it has cached something somewhere, but I haven't found where.
Unfortunately for those of us who regularly update our ebooks (as opposed to those whose ebooks are generally static) changes to the ebook file cause the slow-start again.
Calibre's ebook viewer has been completely rewritten due to Calibre needing to switch to a newer HTML render engine. It's been out for less than a week, so there are bound to be issues. Hopefully this will improved in future.
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