How are you using Plex? Try access the UI via a different browser, or via the dedicated Plex app. Try a few different ones. Personally I use Safari and find I c

How are you using Plex? Try access the UI via a different browser, or via the dedicated Plex app. Try a few different ones. Personally I use Safari and find I can scroll through my library much faster then the App, or in Chrome. I can also seek pretty quick, even 4k remux files. This is on an all gigabit network. (though client WiFi AC works great too). But transcoding and trying to seek... isn't the best. At least for my macmini plex server.