If you have one of these "latest" GPUs, FromSoftware suggests turning down your graphics options or even lowering screen resolution. Obviously, this doesn't actually solve the core issue, but it should make the game smoother to play.
"We have confirmed that some PC configurations using the latest graphics cards may experience framerate drops," the developer said. "We are currently investigating the cause. In the meantime, If you experience significant framerate drops, you may be able to resolve it by setting the graphics settings from the default "High" to "Medium" or "Low" and lowering the screen resolution, as well as installing the latest drivers for your graphics card."