Researchers from the Universite de Lyon recruited 59 male and female volunteers who were native speakers of one of seven common languages? English, French, German, Italian, Japanese, Mandarin, Spanish and one not so common one: Vietnamese.
Japanese for example need to speak faster to tell a same story which a I (as a German native speaker) would tell in less hurry. Maybe that's the reason why people here sometimes get annoyed when they hear a foreigner speaking Japanese ? the information is just coming too slow