1) Ably 2) Capably 3) Closely 4) Competently 5) Densely 6) Expeditiously 7) In a productive manner 8) In an efficient manner 9) Neatly 10) Proficiently 11) Resourcefully 12) Successfully 13) Trimly 14) Well 15) With efficiency Found on https://www.crosswordclues.com/clue/efficiently