How to be meditative and involved at work?

At work, I try to be mindful, deliberate, and calm. I found with the help of meditation and being mindful makes me less distracted and less stressed at my work or whatever I do. But I also feel being mindful, deliberate and calm makes me slow, feels less involved at my work(though I feel focused) and less energetic. I used to be very active and fast at certain stuffs I do but now I dont feel like that if try to be mindful. How to overcome this? I want to be mindful and calm but I also want to be fast and involved at my work(or in other words highly active)?