Is this your crossword clue?
"fastest" is also used as a crossword clue. If that's what you saw, the answer is often quickest (8 letters).
Definitions
Moving or happening more quickly than all others.
Used in a sentence
“He set a new fastest time for running a mile.”
“Scientists say it is one of the world’s fastest-melting glaciers.”
“But thou, when thou fastest, anoint thine head, and wash thy face.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Most quick”7 letters
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F______