On a game console (starting with PS4/xbone) a game ships on a slow optical media and needs to be installed on the hard drive to be played. The install happens w

On a game console (starting with PS4/xbone) a game ships on a slow optical media and needs to be installed on the hard drive to be played. The install happens without user interaction in background. This can be done in two steps - install a small level quickly and let the user play it while installing the rest of the game. Usually the first small part is some kind of tutorial and skipping it makes no sense as the user will be stuck waiting for the rest of the game to install. This two-part install is kind of mandated - the game license requires it by default though if you make a case why it is not possible with Sony/Microsoft, it can be waived.