Why does vsync run so much better with borderless fullscreen than exclusive?

[themanuel]

I don't know what it could be, then. When you say "Dolphin thinks it's running fullspeed", do you mean that dolphin's FPS counter reports 60 FPS but you are measuring 30 FPS some other way? Since you said this affects every game, I'm assuming this happens with games that originally supported 60 FPS without cheat codes.