The quantum of action, which a layperson can consider as the smallest possible state change, is actually Planck's constant.

https://en.wikipedia.org/wiki/Planck_constant

All energy refers to is an amount of state change that is occurring every second that some quantity of energy exists. That's why action has units Energy x Time. You can divide by time and you get Energy = Actions per Second, kinda like APM in Starcraft..

https://en.wikipedia.org/wiki/Action_(physics)

Principle of least action is really the principle of "least change."

In summary, computation is happening -- but most of the computation that energy does while held as mass/matter is cyclic processes (aging.) Not anything interesting, at least to me or you. Unless you like https://en.wikipedia.org/wiki/Radiometric_dating

Maybe. Or maybe they do but we don't know it ;)