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Has it always been like this? Or it was okay up to some point?

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.


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/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach here system.log , error.log , exceptions.log
 
I already had this problem. But I fixed it back then
How did you fix it back then? And what change or update seemed to make it start happening again after that?

There's a mod error in that log. Please disable ALL mods while we work on this.

Please attach here your Documents/Paradox Interactive/CK3/pdx_settings.txt
 
"setting_framerate_cap"={
version=0
value="off"
}
Did you set that cap to 60? If not please try that.