We've added the option to launch the game in DirectX 11 mode for players with lower-end PCs or those experiencing performance issues. You can now choose between DirectX 12 (High Performance) and DirectX 11 (Low Performance) when launching the game.
If the mode selection window doesn’t appear when you start the game, please try restarting Steam and make sure to launch the game directly from the Steam interface, not from a desktop shortcut.