David, you are right again, i'm going nowhere(making no progress) actually i've said on Mon, 05 Jul 2021 05:04:54 +0800that slowness has nothing to do with downloadi open it as local file i believe pdf format used by archive.org is cause of slownessthey are scanned books, and allow you to select text, it's advanced (and complicated) my viewer performs better when viewing pdf files from other source
and my cpu is slower than that used by mainstream users
