When using a laptop connected to external monitor, the game always switches to the iGPU after compiling shaders. MESA_VK_DEVICE_SELECT can be used as a workaround. In a terminal enter "MESA_VK_DEVICE_SELECT=list vulkaninfo" (without quotes) to show selectable devices. Note the discrete gpu id, which looks something like "10ee:248". Paste the id with the following launch command: MESA_VK_DEVICE_SELECT=[id here]! %command% . Do not paste the [] brackets. But do include the exclamation mark following the id, which is used to force your selection.