These people are at high risk for an ADD diagnosis and are also likely to be gifted. They are often brighter than their IQ scores. However, they have relative weaknesses in processing auditory information and sequencing, and are often poor at spelling and phonics. They are likely to act out or space out in school. Such children often need to be accelerated or homeschooled.
Boredom leads to restlessness, and restlessness leads to all sorts of problems.
Fast thought processes can lead not only to boredom but to poor handwriting, errors in simple work, disorganization and sloppiness. This has been well demonstrated in studies. If you use them, you must be on your guard, because serious mistakes can be made. Of special concern is the inability of school to identify very gifted student, such as those with IQs of 160, or 170. Such students are more common than most people realize and require VERY different schooling.