Quite the opposite, if reality were a simulation this is equivalent to more process power instead of less process power.

When you use Classic Mechanics, you only need to "simulate" one trajectory.

With Quantum Mechanics the system may have a few choices, and you must keep the details of all the possibilities. The easy case is a qbit that only has two choices. But if you have a few qbits nearby, they may interact and now you must "simulate" the 2^n possibilities. This is why if we can ever build a quantum computer, it would be exponentially more powerful than a classic computer.