I don't think this is that decisive an argument. One, you don't actually know how fast the simulation might be running (or whether it regularly rewinds to deal

I don't think this is that decisive an argument. One, you don't actually know how fast the simulation might be running (or whether it regularly rewinds to deal with inconsistencies). Two, there appear to be many performance mechanisms built into the universe that one would at least consider in building a simulation of this kind: the speed of light allows for a large degree of isolation, and quantum uncertainty allows some degree of lazy processing. I remain pretty strongly agnostic about all this but I don't think you can escape it easily. One interesting thing to me would be what it would mean for some _rich_ far off signal to be picked up. It seems relatively easy for the universe to maintain a low fidelity simulation about rocks and radiation in space at a distance (plus or minus things like dark matter!) But if we suddenly started receiving broadcasts from an alien civilisation, or even met them face to face, that would be two very rich and detailed timelines that would suddenly have to snap into sync. That's certainly not something I'd allow if I had to build and maintain this stuff (and one can only assume unreasonable deadlines and budgets are universal).