In the Perfect Imperfection by Jacek Dukaj [0] has something called "Remy's curve" [1].
On the curve you can find:
- Ultimate Computer is the computer using the best hardware as allowed by the physical constants of our universe. See also physics of computation.
- Inclusions are in essence 'pocket universes'. They are created for specific entities to run hardware in a dedicated universe with physical constants different from ours, allowing for better performance than those in our universe
- Ultimate Inclusion is the inclusion with the best possible set of physical constants in the entire multiverse
Seth Lloyd wrote a paper "Ultimate physical limits to computation" [2].
[0] https://en.wikipedia.org/wiki/Perfect_Imperfection
[1] https://en.wikipedia.org/wiki/Perfect_Imperfection#/media/Fi...