Huge perfomance issues on night races

Same here, day races run at ~90 fps when I uncap my Vsyncs 60 fps limit, Night races instantly tank the FPS down to 45 - 50. Even when I run same track in GP mode and set it to day time, it will run just fine, as I switch over to Night, the fps instantly tanks. So there definitely is a underlying issue with how night light gets handled that causes ~50% performance issue, which was not the case with previous titles.

Specs: R5 2600, GTX 1060 - 3GB, 32Gb RAM, DxDiag included.

Playing on medium preset at 1080p, but even when changing to lowest possible settings has 0 effect on the FPS in night races.