Need for speed: Heat stutter issues

I have recommended requirements but at the start/end of all races, cop chases, and cutscenes my game drops to like 15 fps for a second or two and it's getting annoying any settings i could change in game or in thw nividia panel? Also i can't seem to get more than 80fps even when free roaming

Also during the night i get about 45-50fps average even when free roaming