lightning fast

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quickly

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superfast

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quick

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double-quick

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swiftly

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fast

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lickety-split

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speedily

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rapidly

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fastly

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sharpish

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instantly

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instantaneously

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expeditiously

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posthaste

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snappily

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presto

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prestissimo

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thick and fast

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promptly

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rapid

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mediately

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briskly

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blazingly

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veloce

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tout de suite

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right away

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at once

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flashily

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apace

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instanter

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just like that

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fleetly

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straightway

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dashingly

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at one blow

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forthwith

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hurriedly

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mile-a-minute

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sharply

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nimbly

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smartly

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hotfoot

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bright and early

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on the fly

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sharp

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blisteringly

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full speed ahead

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brightly

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slam-bang

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subito

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urgently

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sure as shooting

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allegro

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bright

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to the minute

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as all get-out

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summarily

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as all hell

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leaps and bounds

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vivace

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furiously

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efficiently

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light

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precipitately

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acutely

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frantically

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blazes

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ablaze

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by thunder

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without batting an eye

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rashly

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bolt

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meteorically

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impetuously

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