As I said, all kinds of shortcuts would be taken. Video games only render what is in your field of view. How do video games know precisely what to show you when

As I said, all kinds of shortcuts would be taken. Video games only render what is in your field of view. How do video games know precisely what to show you when you look back? The computer has all the physics equations and what you see is just a function of your field of view at that frame in time. So the microscopic world is not physically operating, it is simulated using some heuristics and upon observation the generated microbes are saved to memory. Outer space is empty. When we look out with the Hubble telescope, galaxies are procedurally generated and saved to memory. Once again, only the minimal visual representation is needed. The actual planets and asteroids would only be generated on observation, etc.