Antivirus

I have gtx 1070 evga hybrid, 16gb ram, r5 1600, ssd 250gb samsung evo 960, 1TB HDD and asus prime b350-m motherboard and im getting 35 fps on high-ultra on GTA V, PUBG 55FPS very low, realm royale 100 and soo on, can someone explain me why am I getting soo low frames on my pc? I have it for 1...