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No. Prettify is a strictly manual process. In your case, I'd wager to say the the file size isn't all that relevant to the slowdowns you're experiencing. It sounds to me like the html you're pasting into Sigil has no (or very, very few) line endings in it. One giant line of html code with no line endings is the number one thing that can cause severe slowdowns when editing within Sigil. If whatever you use to create/export your html creates a file with no line endings, that would explain the slowness.
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