Quickly synonyms

Asap (as soon as possible), a mile a minute, abruptly, apace, as soon as possible, at (full) speed, at a gallop, at a rate of knots, at breakneck speed, at full tilt, at high speed, at once, at the double, at the speed of light, at warp speed, before you can say knife, briefly, briskly, cursorily, directly, double quick, early, expeditiously, fast, fleetingly, forthwith, hastily, hell for leather, hotfoot, hurriedly, immediately, in a hurry, in double quick time, in haste, instantaneously, instanter, instantly, lickety-split, like (greased) lightning, like a bat out of hell, like a bomb, like a bullet out of a gun, like a scalded cat, like a shot, like a whirlwind, like an arrow from a bow, like billy-o, like blazes, like crazy, like mad, like nobody's business, like the clappers, like the deuce, like the wind, madly, momentarily, nippily, now, p.d.q. (pretty damn quick), perfunctorily, post-haste, precipitately, promptly, pronto, rapidly, right away, shortly, soon after, soon, speedily, straight away, straight off, straight, suddenly, superficially, swiftly, with all possible haste, with all speed, with dispatch, without delay, without further/more ado, and desultorily are all synonyms for quickly.