When setting the video setting to fullscreen using the new fullscreen button (2 arrows pointing in opposite directions in top right) in the menubar of the application (common to many OS X applications), the games fps is limited to 30. When using the in-game option menu or the keyboard shortcut (F11), the fps is not limited (other than the max possible using hardware).

What I expected to happen: the game would become fullscreen using either way to change it.
What actually happened: The fps of the game decreased and never passed 30 while keeping it on fullscreen (unless I changed the setting in the game's option menu)