GPU USAGE DROPING TO 40-60% WHEN MORE THAN 2-3 AI POLICE CARS IN CHASES

Hi!

So first of all my system:

i7 7700k

12gb ddr 4 ram

gt 1030 2gb gigabyte oc (i know its not ideal but good enough for me till i buy a gtx 1070 or 1080 later)

So my game set to high on els requed options and fxaa on 1920x1080p its around 50-65 fps (99-100% usage) usally sometimess with high chases 6+ ai police cars it got 35-40 fps but good enough for me till upgrade.

But i just reinstalled everything but now i getting gpu usage drops to 50-60% with more than 2 ai police cars i dont know why i read cpu limit but my cpu getin just around 35-45% usage.

I dont know how to fix it but it is very bad cause chase with more than 2 ai police cars is good and i can get 45+ fps mosty not below 35fps now i get 20-25 fps which is bad for 2 ai cars.

I hope someone can help me to fix it! :)