Most people today have had their speech recognized by telephone directory assistance systems, and many have used intelligent search engines on the World Wide Web or bought mutual fund portfolios selected by artificial neural networks. Better than a snail. One reason, of course, is sheer computing power. But the kinds of processing are different, too. That allows the human brain to recognize complicated patterns in an instant.
Computers have to reason out every niggling detail one step at a time.
Human brains also have the advantage of sitting inside human beings, where they can soak up terabytes of information over the years as the humans interact with other humans and with the environment. Technological progress, like scientific discovery, is notoriously unpredictable. When it comes to replacement parts for the body, for example, no one foresaw that artificial hips would become commonplace and artificial hearts elusive. And when it comes to the performance of duplicates of the mind, the most reasonable answer is that computers will probably retain their uneven competence for quite some time. They are likely to do a lot better than they do now for some kinds of thinking, and they will probably not do as well as a human being for other kinds.