I'm writing this for those of you who, like me, had difficulties figuring out how the Pause worked.

In order to Pause/Unpause the game you need to use the F3 button (Obvious so far), however, there seems to be a delay of 4-5 seconds when unpausing the game - i.e. once you press F3 the game will stay paused for several additional seconds before starting to run properly.

If this issue is specific to me then please let me know so that I can try to resolve it somehow...

The only way to avoid those issues is to change to windowed mode, otherwise those weird issues happens >.>