Try the following settings in the menu.
- Set "Quality" to "Low" in "Game Settings"
- Uncheck "Traffic Visible" in "Digital Twin Settings"
- Set "Crowd Size" to 0 in "Digital Twin Settings"
Please try the settings above: "The frame rate is low, and I want to improve it."
Try changing full-screen status by pressing your keyboard's "F11" key.
Change the "Character Type" in "Game Settings" from the "Main Menu" when starting the game (the "Character Type" item will be displayed when "Game Mode" is set to "Quadcopter").
If you select a date and time when the moon is high in the sky, the screen will be illuminated by moonlight (the position and phases of the moon will change depending on the date and time).
Also, setting the "Gamma" in "Game Settings" to a higher value will brighten the screen (though in this case, the screen may become too bright during the day).