Stuttering lag and crackling sound

Hey,
I got Bl:TPS and i get this wierd lag. My game stutters even in the main menu but i get like 100 fps.
I tried fixes on the internet like re-intalling drivers and they work then 30 mins into the game it starts stuttering again. Ive noticed that when the game starts, a service called “System interrupts” shows up and it uses ~ 12% of my cpu power. Its only there for BL:TPS.
Specs:
CPU:Intel 6700k
GPU:2x Nvidia gtx 980 (msi)
8bg ram
Windows 10
Thanks.