comictagger VS comic-compress

What you can try is to use https://github.com/comictagger/comictagger to pre-tag your books. If your books are already imported, you might need a calibre plugin called Embed Comic Metadata. So you can load your zips/cbz from the calibre folder into comictagger -> save. Then load metadata back into calibre via the plugin. BUT BE AWARE: It might override existing data like Title or Series. So doublecheck after autotagging and before re-importing metadata.

(Optional for metadata edits) ComicTagger https://github.com/comictagger/comictagger

For comics, I use comictagger + komga.

There's the bookshelf plugin that works rather well with comics and mangas in jellyfin. Most of my books/comics/mangas are tagged with the comictagger app available free on GitHub https://github.com/comictagger/comictagger.

I was going to suggest taking a look at comictagger - https://github.com/comictagger/comictagger. I'm not 100% on whether it can handle PDFs or epubs though

Well, for most manga, I first run it through ComicTagger: https://github.com/comictagger/comictagger

Look into comic-tagger. It's a CLI program which has the ability to parse file names of both CBZ and CBR and will attempt to match and pull metadata from comicvine. https://github.com/comictagger/comictagger/releases

If you do go with another alternative, you can still use ComicVine data with something like ComicTagger. I've not personally used it, but I've seen others use it with success. Hopefully that helps!

As my library was approaching a 900gbs, I decided it'd be best to try to convert it from jpegs to webp. I had heard that CbxConverter was one the best ways to do so but it's painfully slow. Someone then recommended rocketBang's compression tool which can use parallel processing to make the compression/converting MUCH faster.