If we take the assumption that the mind is a physical system, then it would still only be a matter of time before we found the reason for the difference in comp

If we take the assumption that the mind is a physical system, then it would still only be a matter of time before we found the reason for the difference in computational ability I don't see how the latter follows from the former. The physicality of the mind says nothing of its computability. You're assuming the computationalist axiom that reality is completely computable, which is quite an assumption. The brain is still a combination of proteins, amino acids, and a few other chemicals. We would just have to move to using chemical computers (which are already being researched) We already produce hundreds of thousands of them every day. The process is rather fun. As some point the definition of success has been stretched so far as to be meaningless.