I disagree on the speed. The “human level intelligence” would be about as fast as a human on tasks. It might do them very differently, so it could be superhumanly fast at some things like reading a whole book.

The thing that I doubt is that this would create the prophecised feedback loop. Sure, the AI could be a bit better than a human at further developing itself but it is probably also really hard to increase the intelligence.

One thing that can’t be denied is that AGI could be taught once and then cloned instead of all the work that goes into training humans.