DS10 is a slow processor (in WISC and real life), but also super visual. I find that anything he can see as a picture in his head and doesn't have to turn into words, he can do frighteningly fast, including the kinds of math where he can "see" the problem/ solution. Other things, not so much.
So he maxed out the visual-spatial Block Design, even though that's the timed test that usually gets the slow processors. But he needs about an hour to produce a written sentence.... I suspect there are many, many complicating factors of memory and processing that affect both the testing and what we experience in everyday life.
