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Sgil is slow, because it completely rearranges the book into a new directory structure and update the book accordingly. If set, it'll also clean and reformat the HTML on opening. It does require a lot of CPU power, and it can take several *minutes* to open large books (as you have already observed).
Edit Book just explodes the book and shows the files, without rearranging or cleaning anythig (as long as you don't tell it to do so), so it's much faster opening large books.
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