Albert Einstein devoted three years of his life to deep focus on the specific task of generalizing his theory of relativity. He didn't work on ten things during this period—he directed all of his precious attention to the one thing that really mattered.
Attention Residue is the scientific concept that there is a cognitive switching cost to shifting your attention from one task to another. When your attention is shifted, there is a "residue" that remains with the prior task and impairs your cognitive performance on the new task.
To fight back, here are 4 strategies you can implement today: (1) Create a boot-up sequence, (2) Schedule focus blocks, (3) Take a walk, and (4) Leverage Parkinson's Law.