VSYNC Stuttering issue on Non-VRR displays

My theory is it's to do with how they did the lighting, that's why in towns it's bad because of the shadows and more light sources. A town shouldn't take up much CPU because it's just a bunch of hollow polygons, that's why some towns on some maps like Mexico are fine but others like Corsica are terrible. They need to rework the lighting, that will even solve the problem of people complaining about the graphics, because sometimes the game looks real when the lighting is right, other times it looks awful and washed out in bad lighting.