あっという間に (translations)→ immediately instantly quickly rapidly
あわただしく (translations)→ fly hastily hurry restively
さっそく (translations)→ directly present promptly right straight very
さっと (translations)→ abruptly brief briefly briskly casually effectually fling lightly quick severely sharp sharply suddenly swing whisk
すうっと (translations)→ faintly gently
すぐ (translations)→ automatically close closely dutifully easily easy first instantaneously just minute now presently pronto quite simply soon then willingly
すばやく (translations)→ cursorily deftly hasty immediate speedy
せかせかと (translations)→ busily jauntily nervous nervously urgently
せわしげに (translations)→ frenzied furiously
たちどころに (translations)→ overnight
たちまち (translations)→ already completely instantaneous momentarily outright short speedily sudden
はっと (translations)→ alarm alert dead hurriedly jolt start startle
ばたばたと (translations)→ fuss wildly
みるみる (translations)→ dramatically perceptibly visibly well
急いで (translations)→ smartly swift
急に (translations)→ begin considerably snap
すぐに (translations)→ fast forthwith in a bit inevitably straightaway