Multitasking is Killing Your Brain
Larry Kim

First, IQ is not a valid measurement of intelligence. Second, in your first pic it clearly shows that the same amount of work was done but it was spread out over several projects so it only seems like nothing was done. In my profession where you have priorities that sometimes coincide some work on all is necessary because it moves them along and allows other teams that I work with to able to do some of their work. Moving things in increments helps me to also break down the work in each in smaller bites and allows me fresh perspectives each time I come back to them. Often times resulting in breakthroughs.