twenty to the dozen
hyperfluent
superspeedy
lickety
prestissimo
quick as a flash
superquick
hyperfast
superfast
apace
lightning-quick
faster than Minute Rice
blistering
blazing
amain
fluently
at full tilt
presto
like the wind
briskly
elegantly
pacey
alacritous
like a rat up a drainpipe
rapidly
with a quickness
speedfully
dartingly
like a dose of salts
bullet
like shit through a goose
mile-a-minute
vivace
kickingly
splitting
vibrant
furiously
overfluent
volley
hand over hand
fast
whip through
supervigorous
uptempo
to beat the band
hell-for-leather
lightning fast
superspeed
lightningly
tachy-