about 1 year ago - AndrewT - Direct link
When you say 'an event' you mean host an MP game I guess?

If so, has this ever worked for you? Or it has always been like that?

Any mods involved?

Can you play MP okay when someone else hosts?  
about 1 year ago - AndrewT - Direct link
Ah, okay, I don't play this game so I'm unaware of mechanics like that.

We cannot help with modded games here at all, so please disable ALL mods and test this with a new campaign.

If you still get this, 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.

Any better then?