Photocopying has little to do with simulation of the physical world.

First of all, Bits != Q-bits. You can clone bits. You can't clone Q-bits: https://en.m.wikipedia.org/wiki/No-cloning_theorem

Second, photocopies are static. The physical world is not static.

Why would their be exponential slowdown? Time can be relative, but superbroadcasting can help explain the loss of fidelity as we scale down. So you can't "Clone" but you can superentangle multiple copies in a degraded state.

The slowdown is in the simulation, not in the internally perceived flow of time. The internally perceived flow of time would of course not change.

The problem is that an exponential slowdown at each level requires discounting the probability of being in a simulation by an exponential amount per level. So instead of being able to say that the weighted odds of being in a simulation are higher than the odds of not being in a simulation, you have to say that, at best, there's a small chance of being in a simulation.

but if you have entanglement, you don't have slowdown. that was my point. It's "wasteful", by producing multiple copies to have a probablity across the set, but it does allow it to be "Parrallel" so no exponetial slowdown.