Fascinating, I was literally thinking about how to communicate this to coworkers the other day, literally down to the gantt chart. Now I don't even have to make one =)

> We are now talking about software development, but this is applicable to all processes that take longer than you would like.

Indeed, it's kind of a generalized version of Amdahl's law. Since we only speed up a portion of the work, there are upper bounds on time saved. Worse, work in progress tends to bunch up at a specific point: code review. A coworker of mine literally complained two months ago now that nobody was reviewing code (and that it was blocking his work). I'm not sure review delay has actually gotten better since.