очень быстро

1) General subject: amain, at a fast clip, at a great pace, at a quick pace, at railway speed, before (one) can say Jack Robinson, before (one) could say Jack Robinson, by leaps and bounds, double quick, double-quick, express, in a zip, in less than no time, in no time, keep the enemy on the jump, like a bat out of hell, like a lamplighter (to run like a lamplighter - бежать как угорелый; бежать, сломя голову; бежать без оглядки), like fun, like one o'clock, next to no time, on the jump, posthaste, quick as a wink (I turned around to look at the speeding car, and quick as a wink it was gone. Я повернулся взглянуть на мчащуюся машину, и она молниеносно исчезла.), switch and spurs

2) Colloquial: before you can say Jack Robinson (Very quickly.)

3) American: stop-and-pop

4) Military: with nose well down (о марше)

5) Australian slang: flat out

6) Music: molto allegro

7) Jargon: like the clappers, PDO (pretty damn quick)

8) Makarov: at a rate of knots, before one can say Jack Robinson, before one could say Jack Robinson

9) Taboo: like a shot out of hell, like hell, like shit through a goose, quicker than hell, split-ass

10) Phraseological unit: three shakes of a dead lamb's tail, by lips and bounds