Answer:

speedier

Answer	Crossword Clue
SPEEDIER	More like Alka-Seltzer?
SPEEDIER	More prompt
SPEEDIER	Faster

SPEEDIER	At a faster rate.
SPEEDIER	Like a certain tortoise
SPEEDIER	Less time-consuming
SPEEDIER	More swift
SPEEDIER	More rapid
SPEEDIER	More likely to finish first
SPEEDIER	More expeditious
SPEEDIER	Like express mail vis-a-vis regular mail