I have this theory that processing speed for potentially complex tasks--meaning tasks for which there are multiple outcomes, ranging from an inability to perform the task through a simplistic interpretation all the way to complex and nuanced analysis--tends to go up with increasing IQ. An example would be how long it takes for a person to write to a potentially complex prompt (open ended, unlimited time).

Is this a thing? And if so, can you point me to any research that has confirmed it?

Thanks!

If you can obtain access to it anywhere, you might enjoy plowing through this special issue on mental speed:
https://www.mdpi.com/journal/jintelligence/special_issues/mentalspeed

Edit: actually, it appears you can download the whole issue, as it is open-access. Though I'm not sure if this is a totally legit journal, as there are articles arguing that the publisher has other not-legit journals, as well as those arguing that they have journals with recognition from respected organizations. So read with caution, I guess.

Thanks aeh!