Horizon Zero Dawn devs are investigating problems with the PC version – Engadget

Some of those are relatively minor, including anisotropic filter settings that barely work. Nevertheless, others are more concerning, including animations that just refresh at 30 fps when everything is performing at 60 fps, and a very sluggish optimization process at bootup. Others are more major, consisting of huge frame rate dropoffs, stuttering and outright crashing. Some gamers reported these kinds of bugs even with high-end GPUs and PC setups.
Guerrilla said it has seen a lot of the reports published on Steam, Reddit or its website, and advised users to continue reporting any issues. The fact that its examining implies a repair might be a methods off, however the business promised that “we will update you all as soon as we have more news.”