You perform differently when your nervous system stops interpreting everything as urgent.

There is a different quality to work done from a settled state. When everything registers as urgent, you react rather than think, and the reactions are fast, defensive, and shallow. Once the alarm quietens, the same tasks are handled with more care and considerably less effort.

Before starting something demanding, spend five minutes doing nothing at all. Slow breathing, a walk to the window, no input. It sounds trivial and it changes the quality of the next hour.