For NVIDIA Graphics Cards
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Open the Nvidia Control Panel. You can do this by right-clicking on the desktop.
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Select Manage 3D Settings under 3D Settings.
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Click on the "Program Settings" tab and select the theHunter game.
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From the second option "Select the preferred graphics processor for this program", select High-performance Nvidia processor from the drop down list (you can see what the automatic option is listed as global setting).
For ATI/AMD graphics cards
Open the control center in the same way as above. You may need to open graphics then PowerPlay and set plugged in and/or battery to maximize performance. You can also try going to graphics then 3D and move the slider to performance. Your computer may also have a switchable graphics tab where you can change the settings for individual programs.
For Windows 10 users
Please refer to below page: