My problems are less about speed and more about compatibility. I have Plex and jelly thing set up next to each other as containers on the same media database. There’s quite a number of videos that play on Plex that will not play on jellyfin. It could be problems between the two clients.
I’ve understood that “performance” in this sort of context mean how quickly a given task is done
They’re mostly just using FFmpeg behind the scenes, which is exactly how Plex did it to start with. Plex spent a long time working on hardware acceleration, it’s hard to tell exactly what they’re doing at this point but it’s safe to say they spend a hell of a lot of time on it so I doubt they’re just using FFmpeg for hardware acceleration anymore.
Hilarious if they are, they’d just be getting people to pay to use their own hardware