Excrutiatingly slow import, and import doesn't read cache on retry

The EPUB imports are insanely slow for me. My M4 Max also spins up like crazy while doing imports of a large EPUB pile. Does the app convert the epubs? What is it doing? Code compilation takes less time than it does for it to import a few EPUBs for me. Also, if i import my epubs, then run the import again for the same batch of epubs, the import will take just as long. The app should do a hash check and skip duplicate files.