deazy said:
the performance issue displays in dropping fps the longer we play the game. When we start playing I get solid 165 without any drops. After 1-2 hours of playing I am down to 30-50fps (regarding if there are any armies moving). After a restart the borders dont glow and I get a solid framerate again
That's a restart of the game or the computer? Because typically slowness after playing for a period would be a symptom of overheating.
DXDIAG is a program you run from a command prompt or the Windows start menu 'run' dialog box (or 'search programs' in Windows 7 or later). 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 your Documents/Paradox/CK3/pdx_settings.txt .
From your Documents/Paradox/CK3/logs/ folder, attach system.log , error.log