Performance greatly improves by running it off SSDs. I run it on Alwyzon, Contabo and raspberry pi 4s.
Anything under 10 concurrent users (at the same time) should be fine on 4 GB Ram and 2 cores.
If you start implementing Onlydocs/collabora and add tesseract you might want more.
As an avid podcast listener I use Pocket Casts. But I have been looking for something to replace this, especially to own my listening status and save favourite episodes.
Either I haven’t tried it properly enough or there simply isn’t anything out there.
My experiences:
Podfetch: Very very basic, can’t get Favourites to work, doesn’t save specific episodes into a permanent archive, couldn’t get playing to work, no mobile apps
Plex: Cancelled Podcast support two years ago
Audiobookshelf: As described by others, performance issues (I have ~117 podcasts and updating takes ages), iOS app is Testflight only and BETA is full. Wanted retest with it being only an intermediary.