I’m hosting a full Arr stack, Jellyfin, Navidrome, Calibre-Web, plus others. The only significant slowdowns I saw were when I ran a RAM-hungry Minecraft Java server as well.

I always see people saying the Pi is poor for Jellyfin, but I’m running it on a 5 4GB (alongside a fair few other Docker images) and haven’t encountered any really issues. I’m only streaming 1080p and never see any stuttering or bad transcoding.

That said, I do intend to go with a SFF PC in the future as I’ve pretty quickly hit the point where it’d be better, so OP I would skip the Pi as well.