The more media you have on your server, the larger the Plex Data Folder (mine is 110 GB).
You can move it to another local drive if desired: [HowTo] An extended guide on how to move the Plex data folder on Windows
You can also reduce the size by disabling some features such as thumbnail generation: Why is my Plex Media Server directory so large?
For the audio, in the Player section of the settings, enable Exclusive Audio. Be aware you won’t hear audio from other sources while using Plex Desktop.
You can also try changing the Audio Device from Auto, to the specific device for your system. You can then pick the device kind and what audio codecs are passed to it.
Example, I use a small TV as a computer monitor. Audio Device = VL260M, Device Kind = HDMI, Audio Channels = Auto, and Passthrough Dolby Digital is enabled.
Not sure about the black screen problems. I have not experience such on my PC. I’ve Video Playback Quality = Normal and hardware decoding also enabled.
For scrolling, do you mean scrolling through a library or forward and backward while watching a movie/show? I’ve not had issues with either.
