Doing one thing at a time feels slow. It’s how you stop doing everything twice.

Handling one task at a time only feels slow. Split attention produces work with errors in it, and the errors come back as a second pass you never planned for, so the fast route turns into the slow one with frustration added. The sensation of speed comes from switching, not from finishing. What counts is what exists at the end.

Take the next hour and run tasks one at a time, each all the way through before you open the following one. One tab, one page, one job. Then compare the result with a normal scattered hour.