amain apace at flank speed double-quick expeditiously fast hand over fist hand over hand hastily hell for leather hell-bent hell-bent for election in double time in double-quick time in high in high gear in seven-league boots lickety-cut on the double post posthaste promptly quick quickly rapidly snappily speedily swiftly trippingly under forced draft whip and spur with all haste with giant strides with rapid strides with speed