A time dilation tool from an anime is discussed for its practical use on Earth; there seem surprisingly few uses and none that will change the world, due to the severe penalties humans would incur while using it, and basic constraints like Amdahl's law limit the scientific uses. A comparison with the position of an Artificial Intelligence such as an emulated human brain seems fair, except most of the time dilation disadvantages do not apply or can be ameliorated and hence any speedups could be quite effectively exploited. I suggest that skeptics of the idea that speedups give advantages are implicitly working off the crippled time dilation tool and not making allowance for the disanalogies.
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Indeed. Put a hyperbolic time chamber inside another hyperbolic time chamber, and you get a speedup factor of 365 squared.
I think the characters in Primer may have done something like this, getting around a limitation of their time machine by putting a second time machine inside of the first. Then again, the movie isn't always clear as to what's happening, so it's hard to tell...
Yeah, it would be interesting, but it's not doable in either the original DBZ scenario, or in upload scenarios: you can't emulate an emulator and get a speedup like that - the buckpassing doesn't work, the computations still have to be done somewhere.
(Any optimization you could apply to emulating an emulation, like some sort of Futamura projection collapsing the emulated program and the emulated hardware, could be done at the original emulation level, so all it leaves you with is possible programming convenience and constant factors of inefficiency and indirection.)