Taking too long to load the epub books

[Prabakaran1410]

We are trying to use this epubcheck for the checking whether epub has audio or not? But it is taking 8-10 secs for loading the book itself. This is impacting our performance. Can you please help us with some options to load the book quickly and get the hasAudio meta info?

[titusz]

This tool is a simple wrapper around https://github.com/w3c/epubcheck which does an exhaustive analysis of the EPUB file. If the requirement is to only check if the EPUB contains audio that could indeed be done much faster with a custom script that does not load the entire EPUB. If you are interested in sponsoring such a feature I am happy to look into it.

[tthkbw]

Similar performance issue. I have a python script that processes epubs and I use EpubCheck to verify the books both before and after changes. I had been using EpubCheck installed on my Mac with Home-brew to run EpubCheck (using subprocess.run(). So I called the java program EpubCheck from within my python script.

To simplify things with respect to compatibility with Windows, I began using this EpubCheck integration. However, it is really slow compared to just running the java EpubCheck with subprocess.

I measure performance from within my python script for EpubCheck. If I use the Homebrew EpubCheck run with subprocess, on a particular book (that generates no errors and no warnings), the Homebrew version takes 2.2 seconds. If I run the same book with the epubcheck module, it takes 10.3 seconds.

That's nearly five times slower, which seems like a lot to me. Any ideas as to what can be done to get it closer to the performance of subprocess?