How could you know what a perfect simulated version of me would do in advance, without first running the code? Even if you found a more efficient algorithm for getting the exact same end states faster, at some point you will reach a computationally irreducible limit, where you can’t predict what the improved simulated agent will do without first actually running the code. When you run the code it will freely decide to do one thing over another, and no one can know what this will be in advance, even in principle.