Source: http://www.computerandvideogames.com/327281/batman-arkham-city-pc-players-reporting-dx11-problems/ Warner promises patch, offers advice More news, movies, screens & features at our Batman: Arkham City game hub. Batman: Arkham Citys not out on PC in the UK until tomorrow, but already US players are reporting problems with the mouse and keyboard version. Specifically, its the Rocksteady titles DirectX 11 support thats causing problems, with multiple early bird players reporting a huge increase in performance when downgrading to an older version of DirectX. Publisher Warner Bros has promised a patch on Arkham Citys official forums , and offered advice on what to do. Instructions for changing DX 11 to DX 9 The Launcher can be accessed on Games for Windows LIVE and Steam to change DX 11 to DX 9 in the Settings menu. Change both DirectX 11 Features and DirectX 11 Tessellation to OFF. Games for Windows LIVE Start > All Programs > Games > Right click on Batman: Ar...