When you have few minutes of free time, classify and schedule collected stuff from your Process bucket.
If it takes under two minutes to do something, it should be done immediately. Otherwise move it into a Projects bucket. You can also use the Pomodoro timer to help you focus and get stuff done faster.
Learn more about the GTD method.
Multitasking is a Human Delusion. Counter to common belief our brains do not multi task.
This is where the Pomodoro Timer forces you to focus on 1 task at a time into 25-minute intervals.
Learn more about Pomodor timer and GSDfaster.