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Thank you for the feedback.
About plaintext being bad for metadata - sure, it can be converted to anything as long as this process takes hours, not weeks. The thing I want to achieve is not to unpack original article archives.
By the way, I was trying to speed up Calibre importing at first. I find out that the process is HDD IO bound, that moving it to tmpfs speeds things up three times at least. May be there is a way to do "fast" import of files, avoiding the usual import procedure? That would be a workaround about problem.
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