I was playing cities skylines and I realized it was laggy despite me having 4GB dedicated graphics.
then I realised the graphics card was not detected by windows. I am able to play only with Intel HD graphics 620.
Open your bios and there should be an option to use PCI-e graphics over on board graphics.
Also update your graphics driver if you haven't already Download Drivers
if you are running a desktop you only need to attach the monitor to the dedicated graphic card, on laptops if is possible, you should not do it, most of the system use the integrated graphic card to handle the pc
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