Amongst specialists of the mind, it is widely accepted that the concept of ‘multi-tasking’ is myth rather than skill.
When one practices multi-tasking, the actual occurrence is not the splitting of focus, but rather the consistent switching of focus. The process follows a pattern of focussing on one stimulus, removing that focus, then placing that focus upon another stimulus.
Repetition of this process creates a toll on the mind in the form of fatigue and toxin build up from added effort.
Due to the aforementioned consequences of multi-tasking, it is often recommended that for those who desire producitivity on their journey, to employ a lasered focus instead.
In this instance, lasered focus refers to focussing on one task at a time.