system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] In the continuities that his intelligence is a power, Would Superman get dumber under a red sun?
gpt
A lot of Superman’s intelligence (at least his super-intelligence) has to do with speed, raw number-crunching ability, and memorization.  That stuff probably wouldn’t be available.  

Even without his powers, Clark is a really smart guy.  He’s a college graduate with a demanding job in a competitive field.  His natural intelligence is on the level of a main character in a tv drama with good writers, where they have to catch the murderer or figure out what disease a person has.  He’d fit right in on The West Wing or Grey’s Anatomy.  He doesn’t lose that.

So in a red sun system, he won’t be able to speed-memorize a set of encyclopedias in 5 seconds, or compute pi to 100,000 places, but he won’t come across as *dumb*.  He’ll just seem like a normal very smart person.