over 2 years ago - AndrewT - Direct link
DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach here your Documents/Paradox Interactive/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach here system.log , error.log


Please report the temperatures of your CPU and video (GPU)
1/ before starting the game up and
2/ after say 10 minutes' play.
If your PC's vendor has given you no way of reading temperatures, install
SPEEDFAN http://www.almico.com/sfdownload.php  
over 2 years ago - AndrewT - Direct link
87c is the cause of this problem IMO.

If you disable Vsync and set the frame rate cap to 60 in the launcher "game settings" menu, does it run cooler?  
over 2 years ago - AndrewT - Direct link
Can you check if the frame rate cap is effective? What fps are you seeing when set up like that?