This totally worked. Thanks!
Guys,
you are repeating and repeating a fake solution that is just a trick to show the game in borderless window.
By these settings you are just cheating the game and making it to think that fullscreen=borderless window. That is why you will read "full screen" in ingame options but still the game is windowed (and you can just press the start button on the keyboard to show it).
Please read a few post above: THIS IS NOT THE SOLUTION. The game shall still be suffering of poor performance compared to the one you would obtain with a true fullscreen.
