You’re not multitasking. You’re doing three things at sixty percent and calling it a skill.

Switching quickly between tasks is not the same as doing them together, and every switch costs a few seconds of reloading whatever you just dropped. Add that up across an afternoon and a serious chunk of your time went into the changing rather than the doing. It feels efficient because it feels busy, and busy is the sensation people mistake for output.

Try one thing at a time for an hour and see what actually gets finished. Close the other tabs. One thing done properly usually takes less total time than three things half done.