Let's assume the universe is fundamentally a system of computations, in which the sum of past calculations leads to a certain state at any given point in time. Let's also assume that all the calculations happening at a certain time consume too much processing power for the "host" to calculate, which would mean there have to be optimizations, similar to only calculating the field of view of the player in a video game. The latter would result in a state which is only partially calculated. Can both assumptions be true at the same time so that, at least in theory, each state can be calculated, even if past states are incomplete?