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Single-task, don’t multitask. Multitasking actually decreases productivity while giving the perception of increased productivity.
Multitasking by itself is not literal 'multitasking', but rather rapid switching of our attention between active tasks.
To do so, we have to 'switch context'. context switching generates wasted time e.g. via finding the right tools and materials, app opening time, attention switching, deciding what to do next etc.
Your brain also pays the toll: Quick shifting between tasks and making extra decisions decreases ability to continue doing so. It is mentally draining.
Instead, just single-task. Focus and do one thing at a time, and do it well.