[nertirs]

The problem is that there are no qualities, that distinguish a simulation from reality. For all we know, we might as well be living in the worst simulation with unrealistic physics and poor graphics, which was made by a regular student on a weekend, who received a C- for effort.

If the simulation is already simulating all the particles in the universe, then it doesn't matter what humanity does with all those particles. With access to all the particles in the universe humanity could easily simulate every single particle in a smaller universe at a high tick rate. A simulated humanity could even easily simulate every particle in a bigger universe, if we remove the requirement to render the world at a high tick rate.

[Beijinger]

"If the simulation is ,already simulating all the particles in the universe, then it doesn't matter what humanity does with all those particles"

That would be very unlikely, again, mathematics would likely be the same and this limits options. The guys simulation us would be bound to mathematics and limits (e.g. computational crunching power).

In "grand theft auto" you also just simulated/render, what is necessary at a given moment. By the way, the rendering would be a nice interpretation for the "observer" of the Copenhagen interpretation of quantum mechanics :-)

[nertirs]

You assume, that time has to pass at the same speed in the simulation as in the simulating world. Even with our current computing power we could simulate very complex scenarios, if we spend a year of continuous computing on a nanosecond of said scenario.

You assume, that the simulating world is bound by the same restrictions as the simulation. Maybe the difference between our simulated world and the real world is the same like the difference between minecraft and our world.

We have trouble to predict, what the world will look like in a hundred years. And we have thousands of years of data on both humanity and our world. What hope do we have to state even one true fact about a world, that is simulating ours?