Hey I am 5120x1440, 5900x - 3080ti, 120fps+ at all times. Ideas: It may not be engaging the GPU properly because it doesn't consider it worth while with what is being asked. Make the following adjustments to the nvidia 3d settings in the driver panel... Anisotropic filtering: 16x Low Latency Mode - Off (will render more buffer frames) Power Management Mode - Prefer Maximum Performance Shader Cache Size - Disable (theres something weird with how D2 interacts with this) Texture Filtering - High quality Disable all Vsync options (for now). Boot the game up, set everything to the highest settings except.... Turn off AA Turn off Depth of Field Turn off Chromatic Abs Turn off Movement Blur (forgot the exact phrase there) Disable HDR Everything else highest. Close the game. Reboot. Open the game. If it's still chunky, change to fullscreen mode or if youre already on fullscreen change to borderless window. If doing all this doesn't work, come back and we will try some other things, like Ryzen power management settings.