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Plex; Introducing Plex Photos Beta
(www.plex.tv)
This is a most excellent place for technology news and articles.
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
I mean it's not entirely impossible, FFmpeg has also pushed to improve themselves over the years.