I recently had a shower thought that the bigger you go, more energy you need to do computation. As in you could make a computer out of moving planets. On the other hand you could go small and make a computer out of a tiny particle. Both scales achieve the same result but at very different costs.
There is a sci-fi series that I am absolutely blanking on that features that concept - I remember a few characters each having access to a somewhat godlike ability to manipulate physics, and using it to restructure the universe to create computers to augment their own capabilities - definitely some planetary stuff and some quantum / atomic level stuff.. hmmmm maybe gpt can help
This sounds vaguely like the series that Peter F. Hamilton has written, possibly the Commonwealth Saga?
would it happen to be "Zones of Thought" by Vernor Vinge?
Ooh no it is not, but I am coincidentally working my way through the third book in that series!