I have the server on a Drobo 5N and I have 500MB+ upload speed with my internet connection at home. I am now watching something remotely on my iPad where the connection has 100MB+ download speed and I am still getting buffering every few minutes. How can that be? Have I missed out on a setting somewhere or does the remote access traffic go through Plex's servers centrally that might be too busy? I do not understand it.
Check this help article - https://support.plex.tv/hc/en-us/articles/201575036-Why-is-my-video-stream-buffering-