[quote=Actarus]This was a problem in Divinity OS. Make sure your graphic card software is set to use your dedicated GPU. There is also some program that tells you wich GPU is currently used, like GPU-Z.
Also in the BIOS, there is an option called Secure Boot Device. This, when deactivated, D:OS recognized my GPU.
Also try Fraps, to help you know your FPS. This can also help you determine how well the game run.
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I've tried all that I'm having a similar issue, with the game not using my 750M card.