I read that people with autistic disorder, Asperger syndrome (diagnoses from DSM-IV), on average, tend to have weakness in Processing Speed Index in Wechsler tests like WISC-IV (in the case of NVLD PSI is also a weakness, although on average Perceptual Reasoning Index appears to be minimally lower than PSI in NVLD sample (34 individuals) in Identifying Nonverbal Learning Disability Using the WISC-IV: Establishing Diagnostic Differences (Fielding Graduate University, 2010)).
I had no Coding/PSI "valley" in WAIS-R in 2016, in my case, WMI was probably 1 - 3 points higher than VCI and PSI was about 13 - 17 points higher than POI while VCI was 25 points higher than POI - this single difference at least superficially suggests NVLD (although my Block Design result was 5 or 6 scaled scores higher than three other POI subscales, which is very interesting). People with NVLD have rather better result in Picture Completion than in Block Design, but I had 14 in Block Design and 9 in Picture Completion.