i have a strange problem on fps, it dips around 40's even 30's from 60-70 for 4 seconds and then it returns back to 70's. GPU usage is same i dont think there is bottleneck on the system. I upgraded my RAM to 16 GB still nothings changed.    
https://forums.eagle.ru/showthread.php?t=239281   
Also someone is having my problem too.    
2200G CPU 
RX 570 4 GB GPU 
16 GB RAM 
Game is installed on SSD    
I also recorded a video watch carefully