Why with the spit-second subtitles on The Da Vinci Code?

i noticed while i was watching the movie The Da Vinci Code, subtitles would come up and at times, they would flash by so quickly you didnt even see what they said! why? we even tried to slo-mo it so we could read it, no such luck. does anyone know if there is any significance to this? why flash it if it werent meant to be read in the first place??