Brain Food: The 98/2 Rule
The objective? avoid mental drag"Imagine that your brain is a computer. At the beginning of the day, your brain powers up and you have 100 percent of your computer memory available to use on your life. The only problem is that every time you add a task to your to-do list, a little bit of your computer memory goes toward that task."
James Clear • Never Check Email Before Noon (And Other Thoughts on Doing Your Best Work)
The key is to find ways to minimize context shifts and overload while still getting done what needs to get done.