Can you do something fast mindfully? The Zen master Thich Nhat Hanh answers this question.
From my own experience, as the master describes, one has to learn to be mindful by acting slowly and deliberately first. We are often conditioned to be lost in our head or oblivious to everything else when we act quickly. However, once we gain the habit to be mindful, one can also then remember to be mindful in any task, whether it is executed slowly or quickly. As the saying goes, "More speed, less haste", when we learn to act with intention and attention, the amount of mindfulness in the action will not be influenced by the speed of execution. One can be aware at all times. Can you then imagine the power behind that action?