25 days ago - AndrewT - Direct link
Right click on eu4.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.

Then edit the file Documents/paradox/eu4/settings.txt to say:

Vsync=off, refreshRate=60.


Is that any better?