Antonyms for Slow (opposite meaning)
WordNet sense 1 ((used of timepieces) indicating a time ahead of or later than the correct time):
fast
WordNet sense 2 (move faster):
accelerate, quicken, speed
WordNet sense 3 (with rapid movements):
apace, quickly, rapidly, speedily, chop-chop
From the ODE community, based on WordNet
add/edit