I'm able to mix it between the two extreemes; on one hand I can read at about 300wpm and read two lines at the same time and still make coherant sense out of them despite that it shouldn't work.
On the other hand, this provides little more than a basic concept and is difficult to remember. Going much slower, at about my own writing speed, around 100wpm, is far more accurate, as I have time to process every word individually, and make more sense of them as a whole.
The 'speed readers', if yeu actually check into how they do it, basically skip over most of the words and just latch onto things like names, and larger descriptive words. The tiny things like 'if' 'and' 'or' and such they pretty much breeze over since they rarely have any major impact upon the concept being displayed. This can, at times, lead to errors of understanding and judgement if they skip a word that doesn't look important, yet it is.
On the other hand, there are rare cases where someone gets idiot-savant syndrome (not a real syndrome just calling it that) where they basically end up being to perform certain tasks with mechanical like precision far beyond human capabilities normally would allow... but this doesn't translate into anything else of useful value. For example, I had one customer on the phone while I was working at a call center once, and she stated she was able to read over 1000wpm, and had even been dragged to some universities to proove it, and showed she actually DID read every single word individually. My eyes literally can't focus on individual words that quickly, so she's far beyond my own capabilities; apparantly her daughter had similar capacity but not quite as good. Most people would assume this to just be a tall tale, the thing is, these oddities do exist in nature as it's perfectly possible to have a very specialized mind which can just look at the entire page, and intake ALL the information in a much larger area at once, and still process it normally. Chances are, she's not reading individual words, but is in fact just looking at half the page at one time, and somehow is able to accept every word on the page at the same time, then it takes a few seconds to process the data.
Most of us could probably do something similar if we were capable of even getting that much information into our brains at the same time, however, most of us aren't able to actually focus on more than a very very tiny amount of text at a single time. Most of us don't even read a single large word at a time, but instead read it syllable by syllable. *IF* we could actually see more than just a tiny little section we focus on at a time, with anything other than peripheral vision, chances are we'd quickly grow used to being able to process larger amounts of data; most of our brains are CAPABLE of it, they just have never been given the ability to have that information thrown at them that quickly, most of it's discarded before it ever gets to the part of the brain which actually processes the information.
From the time we gain new information (like seeing a picture), the outside's thrown away, anything that isn't moving peripherally is tossed out, it's timestamped for when it was seen, compressed into a more useful form, and then trimmed a bit more of any excess which isn't deemed important. After viewing this information, it's then post-processed for memory, and sorted by the timestamp, missing this step or the previous one are the most common culprits for de ja vu. Low peripheral vision is rarely an issue with the eyes being capable of seeing that far, but moreso of the brain simply just discarding the information that far out of the range of vision before it's ever actually used.
In general though, personality type is quite different than brain type... for example, there are BOTH ENTP females, and ENTP males, despite that they think significantly differently, though some traits are shared. The brain's composition is significantly different here. There's also the fact that one can CHANGE their personality type through excessive effort and training... the hardwired basic functions of the brain aren't capable of being diverted in this manner short of major surgery, though it is possible to train the brain's functions to be more effecient at the tasks it's already capable of. There are strict limits however due to the brain's design, which often influence personality, but do not solely dictate it.