This game should be on the Frostbite 3 engine, that way the loading screen can be an interactive simulation of you walking through your house to the PC/Mac on which you are going to play HOI4.
The game itself runs on a spartan version of Clausewitz 1, to save GPU and CPU power to fully render and animate every spider, speck of dust and pet in your house in real time.
The game itself runs on a spartan version of Clausewitz 1, to save GPU and CPU power to fully render and animate every spider, speck of dust and pet in your house in real time.