Optimizations in computation are used to save processing power and reduce computational time, but the state of the universe can still be calculated, even if past states are incomplete. The optimization only affects the accuracy of the state calculation, but it does not make the calculation impossible. The calculation may not be exact, but it can still provide a relatively close approximation of the state of the universe at any given point in time.

In essence, the universe can be thought of as a system of computations, but the accuracy of these computations can be limited by the processing power of the "host".
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