This is a general idea.

Suppose you have a calculation that takes a long time in the PC. Too long, in fact, that you would be dead before it finished. 

The idea is to design and build instead a physical device that performs that calculation. It is the idea of a model I suppose, like it was used in airplanes.  

it is eerie that it doesn't seem to take any time at all for nature to calculate the state of things. Somethings very complex flow patterns just happens, right in front of your eyes. If the world is a simulation, I'd pay any money to see how that computer works.

As a specific problem, I've always thought about building such a physical calculator to compute large primes.