Soldato
I've improved my performance by doing this:
Install River Tuner Statistics Server - set it to 50fps target framerate.
Go to NVidia Control Panel and make sure Origins is using Performance Mode.
In game, set Vsync to be on. Framerate limit off.
Now I can run the game at a solid 4K 50fps with Ultra profile, but AA is set to Low.
If I don't do this, then the game will fluctuate a lot as it cannot keep a constant 60fps+ but it can at 50fps.
Thank you for this, did the same but 45fps, so much smoother! Even in cities.