Having taken a speed reading course and read guides on it, I’ve akways felt like the main goal was to retrain your mind to process info non-verbally. Once comfortable with that skill, it could be applied to whatever you want. In the extreme case, judging from anecdotes of John Von Neumann, I can only assume he was able to process math reading this way. https://www.quora.com/What-interesting-facts-should-everyone...

Assuming he could speed read math, was a genius because he could speed read math or could he speed read math because he was a genius

Just an example of what the optimum experience would be if you could process non-verbally and utilize the info. Unclear to me what the relationship is between genius and non-verbal processing - can’t hurt to improve the skill and see how the info helps or doesn’t