The document in the OP actually does open in KOReader. It just takes a crazy amount of time and depending on the device in question far too much memory (a little over a gigabyte).
Code:
09/06/25-20:18:54 DEBUG CreDocument: rendering document...
[…]
09/06/25-20:24:43 DEBUG CreDocument: rendering done.
That was on a nearly decade-old i7-6560U laptop CPU, but for its time that was a pretty decent one and in any case probably orders of magnitude faster than any ereader.
Edit: forgot to say, but that EPUB to EPUB conversion opens in 306 milliseconds. (I'd estimate about 2-4 seconds on a device.)
Edit 2: quoting from
https://github.com/koreader/koreader...ent-3263195394
Quote:
As mentionned on mobileread, the .opf is crap:
There are only 89 HTML files in the .epub,
There are 6567 items in the .opf, with only 111 unique ones (which means that some of them are from 11- to 1800-plicated  )
We trust the .opf, and so we open these 89 files but add them as 6567 copies.
May be other reader software do differently.
Nothing for us to fix. This EPUB is just crappy - and you could solve it by editing the .opf in that epub and removing duplicated stuff.
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