I'm not sure why you're referring to the options menu. He says:
Quote: I clicked my mouse in the moment you a red circle. The animation of the circle gives you an impression how much time passes before the application switches to the next thought. To me, there is a significant difference between TB 8 and 9.
He's talking about slowness while navigating the plex which you can see in his videos and is same issue I'm having. I've mentioned the slowness specifically in the context of keyboard navigation since I think it's the easiest to repro, but it's the same with mouse use. I realize he's on Windows, I never implied the issue exclusive to macOS, it's just where I've experienced it. Apparently it's also a problem on Windows.
I could be wrong and we're having two separate issues, but that's not what it sounds like to me. Maybe André can confirm?