To speed up loading, you may want to turn off "Mend on Open" in Sigil preferences. But we still check for not well-formed html (even if you decide to not auto fix things) and that involves reading in each xhtml file and parsing it with a strict xml parser to look for errors.
This is what takes the most time even using multiple threads to do the testing.
For a future release, I will see if there is a way to easily prevent the well-formed check on initial load.
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