Synonyms of double-time

1 Syllable
brisk, hot, snap, swift, fleet, quick, fast, pdq, flying
2 Syllables
ready, fasted, breakneck, presto, flashing, snappy, racing, faster, fastest, fleeting, hasty, dashing, rapid, hurried, chop-chop, pronto, nimble, speedball, fleetly, winged
3 Syllables
active, electric, snappily, instanter, instantly, agile, posthaste, hairtrigger, screamin', velocious
4 Syllables
supersonic, hypersonic, expeditious
5 Syllables
immediately, accelerated, expeditive, expeditiously