replace the text in 'game.cfg' with this or test some of the settings in-game with console, r_PostMSAA = 0 has to be set in the console in-game and in MP each time after joining a server.

Here it is>>>

-- [Game-Configuration]
-- Attention: This file is re-generated by the system! Editing is not recommended!

r_Driver = "DX11"
r_fullscreen = 1
r_Height = 1080
r_Width = 1920
sys_highrestex = 1
sys_spec = 4
g_skipIntro = 1
r_colorgrading = 4
r_DepthOfField = 0
cl_fov = 80
pl_movement.power_sprint_targetFov = 80
r_DrawNearFoV = 80
r_HDRLevel = 12
r_HDRBrightLevel = 0.3
r_UseEdgeAA = 0
r_TexMaxAnisotropy = 0
r_PostMSAAEdgeFilterNV = 0
r_PostMSAA = 0
r_SSAO = 0
e_GI = 0
r_HDRBloomMul = 0
g_radialBlur = 0
i_mouse_accel = 0
i_mouse_accel_max = 100
i_mouse_smooth = 0
cl_zoomToggle = 1
cl_crouchtoggle = 1
g_enableInitialLoginScreen = 0
r_MultiGPU = 1
g_useHitSoundFeedback = 1
r_NightVisionBrightLevel = 0
r_NightVisionCamMovNoiseAmount = 0
r_NightVisionCamMovNoiseBlendSpeed = 0

Color grading may be better set to 0, depends how you like your colors, test in-game with console.
NOTE : After tweaking set the game.cfg to 'read only', which is right click > properties.