So It got stuck, I forced it to close, then It will not start in fullscreen again. Stuck loading before even coming to the first set of films.

Tried windowed-borderless -> works, but with HUGE fps loss. I'm talking 32fps whereas with G-sync and fullscreen I'm over 100fps....

Why is that?

Consider yourself lucky. Myself, and thousands of others have never been able to launch Fallout 4 in full screen mode, not even ONCE. Why? Who knows. I've tried everything under the sun, and nothing works.

I have to run in windowed mode....but fortunately I was able to edit one of the fallout 4 files so that I could set it up so that it at least LOOKS like I'm running in full screen...