Language, for any living human being, is like an identity marker that he carries with his everywhere he goes. It not only allows him to communicate his ideas and learn from others, it also helps in in expressing his innermost, most deepest feeling to the people around him.
But when you look into the technicalities of language, it will be seen that while some languages when spoken sound quite slow, there are yet other that would make you seem like the person talking is actually running a train with his tongue.
For instance, Japanese might sound faster than German and Spanish might sound faster than English, it is actually the syllables spoken that give out their speed and texture. It has been reported on studying these languages from various angles that languages like Japanese sound faster because it lacks density while Chinese as a more dense language sounds slower.