> Someone who really understands the concepts and has the aptitude for it will get answers more quickly than someone who is shakier on it

That seems like a big assumption that i don't believe is true in general.

I think its true at an individual level, as you learn more about a subject you will become faster at it. I don't think its true when comparing between different people. Especially if you throw learning disabilities into the mix which is often just code for strong in one area and weak in another, e.g. smart but slow.