I've got a similar-ish theory. "Smart" people get rewarded as a child or adolescent for doing "smart" behavior, which teaches them to interact with deeper and r

I've got a similar-ish theory. "Smart" people get rewarded as a child or adolescent for doing "smart" behavior, which teaches them to interact with deeper and richer observations and insights. If you don't get trained as a "smart" person, you get better responses to surface appearances. The slowness comes out of this natively - "smart" children are taught to do more complicated things with social data, and brains need more time to get the sensory data necessary for more complicated behaviors. It takes a tenth of a second for the Patellar reflex, about a second to recognize a friend and wave hello, and a conversation to get someone on board with your project. No magic required, just training the same sort of behaviors normal people have in the same sort of way. The most difficult part is un-learning "impress people with how clever you are" behaviors.