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Moved to Victoria 3 tech support forum
 
Right click on victoria3.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.


If those don't help:
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/Victoria3/pdx_settings.json .
From your Documents/Paradox Interactive/Victoria3/logs/ folder, attach here system.log , error.log , exceptions.txt
 
I see you have some bluescreens (BSoD) in there, including this one:
Windows Error Reporting:
+++ WER0 +++:
Hata demeti 0x9F_3_DXG_POWER_IRP_TIMEOUT_IMAGE_pci.sys, tür 0
Olay Adı: BlueScreen
Have you seen those happen, are they associated with this game or something else? It's pretty bad because pci.sys is a core Windows driver and should not have bugs or problems like ths - it may be corrupted or infected with malware.

But there are other BSoD in there with different modules, or none at all mentioned. Quite unusual!

Please try this Windows repair tool


AND then please expand your Windows paging file maximum size to 32gb
AND exit every other app you can before starting the game.

Good luck!