Of an action, movement, etc.: quickly or deftly executed; fast, rapid; (of pace) briskly maintained.

Rapid, brisk, vigorous. Also: remarkably good.

Of pace, etc.: Extremely fast; rapid, rattling.

(of a series of events, narrative, etc.) that moves or progresses quickly.

Of pace: fast, ‘rattling’. colloquial.

Of a pace, rate, etc.: Rapid, smart, vigorous.