It saves time but it might just as well mess things up. Multitasking is the norm of the day when one needs to accomplish too many things at the same time.
But research has found that multitasking actually does not get things done rather makes us prone to being ineffective and making more mistakes since the most of us can focus on any task for not more than 15 seconds without getting interrupted.
Also, multi-taskers have been found to be 40% less productive taking 50% more time to complete any given task and making 50% more mistakes as well. Multitasking has been found to lower the IQ as well.