I'm not a pro at this but this blog post is not very convincing to me. I have read evidence that people perform often perform cognitive tasks better under light

I'm not a pro at this but this blog post is not very convincing to me. I have read evidence that people perform often perform cognitive tasks better under light stress, and that stands to reason. It would be a poor brain that did worse at thinking the more you need to do it. I don't think the claim that the thinking rate is fixed is well-sourced in this blog, but there is various good advice that you can take to at least avoid wasting cycles you have spent. One idea is to try to write down decisions and the reasons for them, and get sign-offs, to prevent relitigating things with yourself or others. I'm sure there are a thousand other ideas that are a little more productive than trying to "reduce the pressure you're under" (as if that's something most of us have control over).