It's running slow because it's running at such a low framerate. The speed and the framerate are tied. Old console games used to work that way, which was a problem because games would run at different speeds in different countries (PAL vs NTSC). This is a solved problem in modern games. Just separate the game logic from the display logic. But this AI can't do that because there is nothing but the video.

Add to that that the AI was probably trained on high framerate footage but is only capable of generating low framerate footage and you get (gestures wildly) this