Question / Help Setting for GTA V

[XDsocherboom]

Hi guys ! I want to record Gta v with OBS Classic , but i have lag .
My Rig : Intel SkyLake i5 6400
Gigabyte gtx 1060 6gb
16 gb ram
I use 4500 bitrate and x264 cpu presset : superfast . But i have frame drops ...