reply regarding simulation at nextbigfuture

Not only that, but there's no reason to believe that if there's a universe above, perhaps a root universe or medium that it follows the same laws of physics.  Perhaps, the "matter" like substance of the root universe or medium is infinitely divisible and there's no maximum speed, allowing for infinite computation and storage within finite regions of small volume.

Also will add that a simulation does not necessarily imply simulators, a simulation can occur naturally in some medium, Stephen Wolfram has already shown that arbitrary complex evolution can occur from extraordinarily simple rules and extremely simple initial states all on its own.  From extreme simplicity can emerge maximal possible complexity.

"* We can't know all the information about the universe within the universe. This one is obvious, because we and our instruments are part of the information to know but also part of the universe and bound to its limitations. We can't get all the information required to compute the universe, because a lot of it is escaping the Hubble volume we inhabit."

Physicists have said that if the universe is infinite entire regions the size of the visible universe will repeat at a certain distance, that the number of possible states even of something as large as the visible universe is finite. Even if we lose information, it is said we have a finite set of possible arrangements not infinite, these can be deduced or calculated.

BTW, we know that all video and sound have possible digital representation.   A Brain Computer Interface with a digital computer will be able to record brain activity patterns and cause the brain to replay them, generating all possible qualia and thought from digital information.-to sourcelink