Why Multitasking Can Make You Less Productive

Right now, as you listen, your brain is probably already trying to do something else. A message. A tab. A tiny “check” you promise will only take a second. Here’s the twist: the more you juggle, the more time quietly leaks away—and most of us don’t even feel it happening.

You probably know the obvious interruptions: the ping of a notification, a coworker tapping you on the shoulder, your name lighting up in a group chat. Those are easy to blame. But the more dangerous interruptions are the invisible ones—the tiny choices your brain makes every few minutes: “Should I check email? Maybe I’ll just skim that doc. Wait, I should respond to that message first.” Each micro-decision quietly diverts your attention, not just from what you were doing, but from how deeply you were thinking. Over time, your day stops being a clear path and starts to resemble a maze you’re mapping in real time. You still move, you still work, yet your progress feels oddly fragile—easily knocked off course by the slightest mental nudge or new piece of information. This is where productivity erodes, even when you feel “busy” all day.

At a brain level, those tiny shifts aren’t free—they trigger a full reconfiguration of what your mind is holding ready: goals, rules, priorities, even the “map” of what you were about to do next. Neuroscientists call this executive control kicking in, and every time it does, there’s a brief slowdown and spike in effort, even if you only hopped over to a new tab for 15 seconds. Now stretch that out across your workday: email, chat, slide deck, code editor, calendar, back to chat. Each switch feels trivial, but together they form a kind of “mental tax” that you pay over and over without ever seeing the invoice.