"Basically that quantum interactions are more fundamental to the universe than more terse ones, stochastic randomness or presence/absence." What does more fundamental means? Presence, absence and randomness are included in the set of quantum interactions they are not of a different nature.

" If a computing device (in a universe) is built to compute using more fundamental substance (to that universe) it should stand to reason it is more efficient." What does fundamental substance mean? I don't understand this paragraph.

"If you model a photon, does your model ever move as fast as the photon?" My model does not move. If you meant that my mental visual simulation of a photon moving is slower than a photon moving, yes obviously, it's slowness and lack of accuracy is just a limitation of my brain. How is that related to quantum speedup?

Help me understanding you, I would really like to believe in quantum speedup but the explanation needs to be sound.