Still a hair under a minute to merge all 62 files of that epub in the virtual machine with spellcheck and tag-pair highlighting enabled. Plus the UI was just as responsive as when they were disabled (so long as no editing is taking place).
So after the next release we can officially recommend that those who have to (or choose to) deal with these huge monolithic html files should leave spellcheck and tag-pair highlighting off whenever doing the heavy lifting.
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