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Ok, so broken documents
Use any pdf reader based on Pdfium (like anything based on Chrome or mostly anything based on android). They can help as they spawn multiple threads to render a single document and can handle multiple documents spawing multiple processes (each one with multiple threads).
That doesn't fix the nature of the documents. They will be still broken, will be still slow to navigate them or to jump pages.
If you want to read them using KOReader your best bet is to convert them to djvu. Or just reprint them with ghostscript tweaking some parameters. Or maybe there's a tool that's able to fix utterly big images on them automagically or, at least, fix/convert the color space.
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