Does not influence the graphics as well as performance. Even when you set the value to 0, you can still utilize the rear-view mirrors, but the view will be blurred and you'll only see objects that are close. Can influence the performance, especially when the vehicle has more than one mirror.
Mirrors - Determines the quality of graphics in rear-view mirrors, first-person perspective only. Does not influence the performance, but has an effect on aesthetics of the game. Doesn't have much influence on the performance. If your FPS drop during that times of the day, lower this option, as it also influences the performance.
Light Quality - To check up whether it's the lights that eat up a lot of your graphics card, check your performance during the morning and on the evening.Set them to medium, so the shadows maintain their quality, while performance is kept on an optimal level. Shadow Quality - Shadows can also put a strain on the graphics card and take up a lot of VRAM.
If the game stutters heavily, start by setting this option to 0.
