Constant crashing from a returned player but can't cap my FPS effectively

If GeForce Experience is running, unload that before starting the game - it can override the game's own settings.  

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 , exceptions.log  

We see no crash in ck3.exe in that dxdiag, but there is one in exceptions. Odd.

After one of these crashes can you re-load the game and save and carry on? Or do you need to reboot, or wait a while?

Do try unloading every other app you can before starting the game.  

Sorry, I see no further clues to your problem in there. One more try:
Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox Interactive/CK3 folders - In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.
- re-install game in Steam, run a Steam Verify when done.
- add CK3.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.

THEN Right click on ck3.exe , properties, compatibility. Tick "disable fullScreen optimisations" untick every other box in that dialog, Apply and exit.
Then in the launcher Game Settings menu, select fullScreen display mode, Vsync off, cap refresh rate at 60.


THEN test with a new campaign, not any existing one. If you still get this problem then, I guess it is time for a visit to the Bug Reports forum; do you get crash logs and dump files from these crashes?