1) Accelerates 2) Acts quickly 3) Gets cracking 4) Goes like lightning 5) Goes rapidly 6) High-tails it 7) Hurries up 8) Is quick 9) Makes it snappy 10) Moves along 11) Moves fast 12) Shakes a leg 13) Speeds 14) Speeds up 15) Steps on it 16) Steps up 17) Wastes no time Found on https://www.crosswordclues.com/clue/hastens