It seems intuitive that doing more than one thing at once saves time, but from the brain’s point of view, the opposite is true.
A growing body of neuroscience research is showing that the brain’s capacity for processing more than one task simultaneously is sharply limited. The brain needs to attend to one task at a time; it can’t just double or triple its processing power in line with how many things we are trying to do at once.
We may think we are multi-tasking, but in reality, our brain is rapidly switching its attention resources back and forth from one task to the next.
The bottom line is that multi-tasking may not be the most efficient use of brainpower.
Focusing on one task at a time is likely to get the job done more quickly and with better results.