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All answers having "Speed" as clue:

3 Character Answers:

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HIE

RHO

RIP

ZIP



4 Character Answers:

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DASH

DIAL

METH

PACE

PYRE

RACE

RATE

RUSH

TEAR

TRAP

UPTO

WARP

WING

ZOOM



5 Character Answers:

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ASSET

CHESS

COCOA

DEMON

HASTE

LIMIT

TEMPO

UPPER



6 Character Answers:

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ASSETS

BARREL

GOFAST

HASTEN

ROCKET



8 Character Answers:

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CELERITY

RAPIDITY

VELOCITY



11 Character Answers:

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AMPHETAMINE