"Increased computational resources. "

Surely this doesn't increase intelligence just optimization power. If you are going to introduce definitions stick by them. :)

"Communication speed. Axons carry spike signals at 75 meters per second or less (Kandel et al. 2000). That speed is a fixed consequence of our physiology. In contrast, software minds could be ported to faster hardware, and could therefore process information more rapidly. (Of course, this also depends on the efficiency of the algorithms in use; faster hardware compensates for less efficient software.)"

This seems confusing... When we talk about the speed of computers we generally aren't talking about signal propagation speed (which has been a large fraction of the speed of light in most computers, AFAIK). It hasn't been something we have tried to optimise.

Having something with a fast signal propagation speed would allow for faster reaction times, but I'm not sure what other benefits you are suggesting that it would allow an AI to dominate humanity.

"Goal coordination. Let us call a set of AI copies or near-copies a "copy clan." Given shared goals, a copy clan would not face certain goal coordination problems that limit human effectiveness (Friedman 1993). A human cannot use a hundredfold salary increase to purchase a hundredfold increase in productive hours per day. But a copy clan, if its tasks are parallelizable, could do just that. Any gains made by such a copy clan, or by a human or human organization controlling that clan, could potentially be invested in further AI development, allowing initial advantages to compound."

This seems to neglect the overhead in normal co-ordination, e.g. who does what task. For example say you are doing research: you do a search on a subject and each copy takes one page of google scholar. They then follow interesting references. However these references are likely to overlap so you would get overlap of effort. And because the copy clones are likely to have the same interests, they are more likely to duplicate research compared to normal humans.

"Duplicability" : I'm sceptical of this to a certain extent. While it will lead to very good short-term gains, having lots of computer hardware that think the same way I think will cause some research avenues to be unexplored, due to all copies expecting that avenue to have minimal expected value (e.g. a billion einsteins might ignore quantum physics).

So I wouldn't expect this sort of intelligence explosion to dominate the rest of humanity in research and science.