DD had a low processing speed score on the WISC. Actually it was in the average range but below 100 and there was a large gap between that and her other scores. The coding section, esp. (where kids are asked to copy symbols from a key) was really hard for her. The teacher sees the same thing in class. She is excessively slow with written work, even though it looks like she is focused. It could be dysgraphia, or simply ADHD and not staying mentally focused, or perfectionism, or fine motor issues, or visual-motor issues, or a combination of all of those things.