Back to the initial conversation about processing speed, our son has a bit different profile from the "classic" GT profile.
His VCI, FSIQ & GAI were all >99.9 PR, yet his PSI was also up there at 99.8. (His PRI & WMI were both 99.)
Looking at his WJ Achievement test, he scored 99.8-99.9 PR on all subtests except for Writing Samples, which was a 97.
The kid is a speedy fella, but he's far from using this trait to his full advantage. His biggest problem in school right now is that he doesn't know how to throttle down when necessary. This is definitely a "grass-is-greener-over-yonder" situation, because whenever I read another parent lamenting his child's plodding, perfectionist tendencies, I secretly wish for a bit of that "problem."
I often compare our son's situation to Wile E. Coyote's experience with the ACME Jet-powered Sneakers. When the coyote first donned the shoes, he had no clue how to use them effectively and was bouncing & crashing off of everything. When he figured out how to control them, though -- yowsa.
It's interesting (maddening!!) to watch our son tackle new concepts, especially in math and music. His first attacks are invariably full-throttle, brute-force attempts and when those efforts don't succeed he gets very frustrated. He'll eventually slow himself down (sometimes) but not without putting up a fight first.
With piano in particular, when he's learning a new scale he prefers to tackle it at top speed, even though it takes him many more attempts before he gets it right. When I'm able to convince him to slow down, however, he'll nail it within just a few attempts.
But once he gets a concept (or song or scale) figured out... holy smokes... it is fun to see him fly.
