Blizzard has announced that DLSS Frame Generation and Ray Traced Foliage will be temporarily disabled for the launch of Diablo 4: Vessel of Hatred.
Vessel of Hatred Patch 2.0.1/2.0.2 Patch Notes
In their recent patch notes for Patch 2.0.1/2.0.2, Blizzard has stated that while working on an issue, these features will be disabled for players once Vessel of Hatred officially launches.
What this means for those affected is that, for a short time, your performance while playing Diablo 4 may be decreased. DLSS can drastically improve a game’s performance and, in some situations, can slightly improve image quality. While we don't have an estimate for how long DLSS Frame Generation and Ray Traced Foliage will be disabled, we're sure Blizzard will want these re-enabled as soon as possible after the launch of Diablo 4: Vessel of Hatred.