In the early 1990s, a scientist, named Harold Pashler, did a study on multitasking and his findings were incredible.
When someone is focused on a singular task, they have 0% waste because their brain is not switching between two different tasks. So stacking one item after another was the fastest way to get something done.
When he added in two tasks at the same time, it took the subject 20% longer to complete the two tasks due to the time lost in mental context switching between tasks.
When he added a 3rd task, it took the subject 40% longer to complete the three tasks.
Yet in today's day and age, this is how we all operate. We jump around and hop from project to project, full of distraction.
Turn your pings off.
Stop checking your email.
Stop trying to run 5 projects at once.
Instead, do one thing at a time.
If you can do that, your output will be significantly greater than trying to juggle too many things at one time.