Onedrive is too slow?

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I would advise you to read through this thread:

Plex playing, buffering, stoppage - rclone mount issues

What kind of effect would using the above flags have on a read-only GDrive mount, like mine? Would there be any benefit to using either? If so, which would be better?

I realize you use a different host, but as a Plex user the info would still apply to you. Let us know if that makes it better for you.