Text:
I consent to Plex to: (i) sell certain personal information (hashed emails, advertising identifiers) to third-parties for advertising and marketing purposes; and (ii) store and/or access certain personal information (advertising identifiers, IP address, content being watched) on my device(s) and share that information with Plex’s advertising partners. This data is used to deliver personalised ads and content, ad and content measurement, audience insights and product development. Your consent applies to all devices on which you have Plex installed. You can withdraw your consent at any time in Account Settings or using this page.
Soure: https://www.plex.tv/vendors/ (Might have to clear cache)
Can also read about the changes here: https://www.plex.tv/about/privacy-legal/
Huh? Like just sitting there?
Or is it running a heavy background task like trickplay generation? You can disable trickplay (scrobbling previews) if your system isn't beefy enough to keep up with them.
I run video game servers on my system, and while stream transcodes used to interfere with them, even that was fixed my assigning JF and the games to run on separate CPU cores.