I had a related post not too long ago, it may be what cornerman was thinking of or something else entirely:
Is it possible being a smart, analytical type can actually hold back your game?
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In general, being smart is an advantage.
A smarter person can take limited existing information and squeeze new information out of it,
by making some logical deductions. A less intelligent person can learn the same information,
but it will either take longer for him to figure it out, or he may never get it without some external helper handing it to him.
I see some posters suggesting that an excess of brains is a problem, but they're making some big generalizations... like assuming the smart person is resistant to learning because they think they know it all, or the smart person will look for some shortcut to avoid hours of practice.
The question isn't "will a smart person with an obvious character flaw or bad attitude learn faster than a dumb person who lacks these flaws"... it's assuming all other things are equal.
A lot of these terms are just loaded with expectations - "High IQ", "Smart", "dumb" "Street smarts" etc. I shouldn't even be using "smart" and "high IQ" interchangeably.
IQ is basically a test score, and not everyone agrees on how it should be tested, and whether it's a useful way to predict how successful you'll be in life. There's a book called Emotional Intelligence that deals with this topic. Attitude and maturity have so much more to do with success than whether you can visualize how a 3d box would look unfolded, or whether you can spot the pattern in a series of colored circles.
To answer your question, the higher IQ guy should learn faster but nobody can put a percentage on it. Having double the IQ isn't enough information... are we talking 100 vs 200? Or 60 vs. 30? Huge difference.
PS:
A little editorializing:
Don't worry too much about rehashing old threads. Old topics are 98% of AZB posts. But new people sign up and give new perspectives, and the game/equipment/etc. changes too.
Scolding newbies for reposts, or failing to search, is a time-honored tradition on the internet. It's been around since the days of usenet and even BBSes. And after many years of it, I find the scolding (whether polite, like cornerman... or nasty like black-balled) is much more tiresome than seeing a popular topic revisited.
It's not like the question is even that common, it's not exactly "should I buy a low deflection shaft?" or "which chalk is best?". In any case, props to you for handling it pretty well. Carry on.