Analysis “lag” time is a function of the chemistry / method and NOT whether it is FIA or SFA. Color develops at equal speeds regardless of whether there are air segmentations or not. Since dispersion forces FIA methods to elute peaks within 1 – 2 minutes there is an appearance that FIA is faster. Only methodologies that cannot be performed by FIA, or that perform better by SFA require a 5 – 15 minute lag time for a reaction to occur.