I found that embedding fonts really slowed opening a file to edit.
If Calibre is on the same computer, or if a different computer it has all the same fonts, then embedding fonts in the source isn't needed.
I edit LO Writer in odt and do an extra Save As in docx.
On Calibre Conversion to epub
Look & feel -> Fonts (tab) tick:
[/] Embed all fonts in document
[/] Subset all embedded fonts
Linux Mint 21.3, Mate. Calibre 7.12, but likely I've been doing it for over 8 years. I used to use Word 2002 on XP, but changed to LO Writer on XP, and Calibre 1.38 or something. Switched from XP to Win7 + Linux in Nov 2016 and entirely Linux in Jan 2017.
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