I can't claim to understand the first thing about quantum mechanics, but whenever I read about it I always come to think of lazy evaluation. Then I want to know if it's there simply for performance reasons or if it's to enable an infinite universe.
> "Can the theory that reality is a simulation be tested? We investigate this question based on the assumption that if the system performing the simulation is finite (i.e. has limited resources), then to achieve low computational complexity, such a system would, as in a video game, render content (reality) only at the moment that information becomes available for observation by a player and not at the moment of detection by a machine (that would be part of the simulation and whose detection would also be part of the internal computation performed by the Virtual Reality server before rendering content to the player). Guided by this principle we describe conceptual wave/particle duality experiments aimed at testing the simulation theory."
Here's the kickstarter they (successfully) ran to fund some of the experiments: https://www.kickstarter.com/projects/simulation/do-we-live-i...
You could get a billion different scenarios, each one involving a million locations.
None of them existed before you started playing the game. And generating all of them in advance would be a) impossible, given the memory requirements and b) a huge waste, considering that 99.99999% of the players never needed to experience 99.99999% of the scenarios.
So what they did, they only presented up what is "observable" to you, the player.
So there is some saving there.
If you want purely high-performance model of the Universe, nothing performs better than "everything you observe is simply invented the moment you invent it", be it classical or quantum.