No mention of the game in that dxdiag.
What happens if you run ck3.exe directly? Any error show?
In the game launcher-game settings, choose fullScreen, Vsync Off, and refresh rate 60 . Any difference?
If not, then edit that pdx_settings.txt file and find the renderer line. Change DX11 to OpenGL (exactly like that) - any difference?
What happens if you run ck3.exe directly? Any error show?
In the game launcher-game settings, choose fullScreen, Vsync Off, and refresh rate 60 . Any difference?
If not, then edit that pdx_settings.txt file and find the renderer line. Change DX11 to OpenGL (exactly like that) - any difference?