Not sure why you're being voted down. That's a very sensible and obvious line of thought given the claims in the article. If it's true that our brains are optimized for very low calorie environments but could work much faster, then if and only if there aren't other good reasons to run at low clock rates, "overclocking" the brain could unleash enormous new levels of human intelligence.

Obviously, there are a huge range of possible problems there. Overclocking CPUs is dangerous for heat reasons and the brain generates a lot of heat. Without a doubt, lots of things in the body and mind are evolved around the assumption of a 5-10Hz clock rate. But even just a doubling, or an increase in the efficiency of neuronal transmission ... well, the mind boggles even just trying to imagine what could be done if you can optimize neuronal transmission.

Overclocking the brain is called ADHD, and you probably don't want it (I do and its not exactly pleasant)

Anything that can increase the speed of your brain will have negative impact on you overall. Many drugs can make your brain more capable, but at what cost.

Note that the human brain already accounts for 20% of total glucose consumption despite making up only 2% of your body mass.

I’ll just let the CPU developed over millenia handle clock speeds by itself.