What's a productivity hack you've discovered recently?

I recently started using the Pomodoro Technique 25 minutes of focused work followed by a 5 minute break.

Just like AI builders batch their debugging sessions? Instead of fixing errors as they pop up, they group similar issues and tackle them together. Same principle works for emails, meetings, or any recurring task. The context-switching tax is real - it actually eats up to 40% of productive time.