Bro... you singlehandedly solved the problem I had over months... especially in Cities Skylines 2 I had big issues with FPS. Sure the game itself is causing the issue, as I have read, but I always felt like my PC is so strong... it still should be able to get at least 40 FPS in it. Now after I did what you suggested, it fixxed the issue. Thank you! Kinda weird tho that I have to go into the NVIDIA Settings to change that. One would think, using the graphic card as priority is the default setting.