I don’t have any of those problems with Plex. And the jellyfin interface is absolute garbage. It looks like some high school kid slapped it together for a class project.
It’s missing all of the library cross-linking that I rely on with Plex, especially because the three Plex servers. I administer have at least 8 different libraries, one of them has 12. Plex looks slick and professional. Just like I think it should. Jellyfin looks like a class project, slapped together at the last minute.
For me, Plex loads very, very quickly, and I don’t get any performance boost from jellyfin.
And now that you mention mobile access, I can count on Plex running smoothly and reliably across any client on any device anywhere. And a reliable native app is available on pretty much any platform. With jelly fin, I have to fish around for a client that works on a few platforms, if I’m lucky, and they’re unreliable, unstable, and lacking in most of the features that I know Plex has had for a decade or more.
For me, for the scale of media and the number of servers, I’m administering, it’s not even a choice. I hope jelly Finn gets there eventually, but they are years away from that point.