Only thing I compete with is time and whatever affordances it provides. There’s always constraints so I try to maximize my time efficiency within those constraints.
My process is 100% dedication to task at hand with lots of task switching between tasks. The “7 + or – 3″ guideline of cognitive overload, I’m always pinning the meter, running at max.
I like running at “full” but not the time constraints.
Thankfully, time is very compressible. It just sucks when it hits limits.