The best replacement for fast is quick.

The best alternatives to fast are rated as following:

★★★★★	quick
★★★	quickly
★★	slow
★★	medifast
★★	slow reps
★★	slow metabolism
★★	slow carbs
★	slow zombies
★	fail
★	slow twitch
★	juice fast
★	slow stochastic
★	eating slow
★	quickly grammar
★	slow twitch muscles
★	slow twitch muscle
★	water fast
★	fastly
★	weight watchers
	special k diet
	slow twitch muscle fibers
	shakeology
	cleanse
	slow juicer
	special k
	take me slow
	slow twitch fibers
	optifast
	slow offhand
	gigabit ethernet
	feast diet
	herbalife
	lucene
	solr
	slow squats
	slow shutter speed
	special k protein shake
	special k shakes
	atkins
	carnation instant breakfast
	body by vi
	ensure
	slow muscle fibers
	slow stochastics
	slow fibers
	nexus
	slow blow fuse
	boost
	fast
	interleaved
	slow pushups
	slow carbohydrates
	total lean
	large and slow
	slim fast optima
	nick williams throttle body

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fast

quick

quickly