My DS was IQ tested by a neuropsych at 6 and his processing speed was 75. He was diagnosed with ADHD and started meds. At 9 when he was tested by an LD specialist his processing speed (medicated) was 100. His other index scores stayed within 5 points of each other from one test administration to the other. It seems to me that his processing speed did improve but I assumed it was the medication. He is incredibly slow to respond and gets in repetitive loops when he is not medicated. Clearly from the above posts YMMV.
