The GeForce 364.xx line of graphics drivers hasn't been smooth for NVIDIA. Granted, they tried to merge Vulkan support into their main branch at the same time as several new games, including DirectX 12 ones, launched. It was probably a very difficult period for NVIDIA, but WHQL-certified drivers should be better than this.
Regardless, they're trying, and today they released GeForce Hot Fix Driver 364.96. Some of the early reactions mock NVIDIA for adding “Support for DOOM Open Beta” as the only listed feature of a “hotfix” driver, but I don't see it. It's entirely possible that the current drivers have a known issue with DOOM Open Beta and, thus, they require a hotfix. It's not necessarily “just a profile,” and “profiles” isn't exactly what a hardware vendor does to support a new title.
But anyway, Manuel Guzman, one of the faces for NVIDIA Customer Care, also says that this driver includes fixes for FPS drops in Dark Souls 3. According to some forum-goers, despite its numbering, it also does not contain the Vulkan updates from 364.91. This is probably a good thing, because it would be a bit silly to merge developer-branch features into a customer driver that only intends to solve problems before an official driver can be certified. I mean, that's like patching a flat tire, then drilling a hole in one of the good ones to mess around with it, too.
The GeForce 364.96 Hotfix Drivers are available at NVIDIA's website. If you're having problems, then it might be your solution. Otherwise? Wait until NVIDIA has an official release (or you start getting said problems).