Why do aspies have a low performance IQ?

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I never had a number as a score for my IQ test.

Visual: high average
Verbal: low average
Information Processing: below average
Working memory: low average

I went through the WAIS-IV assessment when I went through the DVR (department of vocational rehabilitation) for my assessment and subsequent diagnosis.
My General IQ was greater than my Functional IQ, both of which were higher than average. The substantial gap between the two gave me what my assessor termed an under-the-radar learning disability as I 'clearly' did not have an average or below average IQ, but that it would explain many of the problems I had with learning. Something about my processing and communication ability was below my capacity for retaining information and my logical processes.

Ok, here you go. My Verbal Comprehension was highest, then Perceptual Reasoning, but my Working Memory and Processing speed were solidly average. There is a 19-36 point difference between the two.

My verbal comprehension score was actually higher than my GAI (General Ability Interval) score, while my Functional IQ (FSIQ) was (apparently) an average of all 4 scores.

I also had the WAIS-IV assessment.

My Perceptual reasoning was highest at 133 (in the very superior range). Followed closely by Processing Speed at 132. Verbal Comprehension was "down" at 118. And then working memory trailing all the way down at 95 - in the average range.

I'd always thought I was crap at maths. It turns out I'm average at maths/arithmatic - it just seemed inferior when compared to my strengths.

You would think I would be acing life, except when it comes to a little thing call "Executive Function"...and an inability to read social cues...and so on...lol

I've never took that test. Though while my Verbal IQ might be above average. Performance would defenitly overturn it.

I don't remember if any of the IQ tests I took differentiated performance vs verbal IQ but there are types of questions I find really easy and types of questions that leave me utterly confused.

The most confusing ones are "what type of word can be created out of <some random letters configuration>", "what word will you add to this word to create a different word" and "what letter comes next".

The easiest ones for me are the pictures or numbers sequences and making 3D cubes from 2D diagrams. I am also pretty good with "car is to road as boat to" and "Which word doesn't belong to the set?" though.

Greetings. To answer your question in the title, I am not sure. I feel maybe it's because they make up their intelligence to people by talking. Society (I believe) feels that if you have good verbal skills, but bad visual-spatial skills that you'll do better than bad verbal skills, but good visual-spatial skills, and since Aspergers is considered a "mild" version of the autism spectrum (I don't want to debate this statement, because I know someone can have severe Aspergers, so maybe I'm looking for high-functioning? I don't know). So maybe they have clump AS because of this? This is my theory, and have no idea if it's right or not.

Anyways, when I did the WCIS-III I believe (or whatever the actual acronym is), I had an IQ of 127. That was 5 years ago. Now, after doing the WAIS-IV, here are my actual results:
FSIQ: 110 (above expected)
VIQ/VCI: 106 (at expected)
PRI (non-verbal): 102 (at expected)
Processing Speed: 119 (above expected)
Working Memory*: 105 (at expected)

My math is considered at above expected, at 115.

*Note: For working memory, the subtest vary dramatically, ranging from 0.8 percentile to 91 percentile. This is why I have a learning disability in working memory. Though I am considered to have an "average" score, it's average is from really low and really high scores, and nothing in the middle.

I did very well on some aspects of the IQ test given to me in my 20''s but very poorly in others. My Testor said that if scored only on what I did well at I would have scored 140 but I did so poorly on everything else I scored 89 overall on the Weschler IQ test.

Performance has always been an issue for me in real life. Poor coordination,short term memory, executive function not to mention very slow processing speed have nearly crippled me for anything other that my current job which I happen to be good at.

I had VIQ 22 points larger than PIQ and I suppose that in Northern America I might be diagnosed with "just" NVLD (which I consider a sort of PDD, not (just) learning disability) and not with PDD and ASD.

"Tri-dimensional tasks" appear too complex for me, but they were not present in my Weschler test.

I am autistic and my IQ scores on processing speed, non-verbal reasoning and imagination are all quite low.

I have undertaken an online Wechsler test, on which I scored 125 for performance and 133 for verbal. I do not know how credible these scores are, though.

In performance part of Weschler's test I had the highest results in Block Design (14) and Coding (13), but lower on Object Assembly (9), Picture Completion (9) and Picture Arrangement (8). In verbal part I had the highest results in Arithmetic (18) and Information (17), lower on Similarities (13), Comprehension (13), Vocabulary (13) and the lowest in Digit Span (11).

I've never actually done the appropriate IQ tests. How would I go about doing all of them?

A clinical psychologist usually does the testing but I wouldn't rely on online IQ tests. From my understanding not only are they testing your intelligence, they are testing your abilities and what your weaknesses are and they also find disabilities that way like specific learning disorder, concrete thinker and learner, and I hear they do test autism that way too and ADD and that is how they also find out if a child is just slow than special needs. They also find how well you can problem solve. I don't think an IQ test alone will detect autism but if the person scores well in pattern recognition, that is a clue. Same as for block design. That was how they found out I was visual and concrete and how I got diagnosed with ADD. They said I lacked attention to detail.