I don't have a source for this, but at some point I read a paper which indicated that for languages with a lower information density per syllable, people speak faster, and vice versa, so on average all humans communicate the same amount of information per second.
Someone speaking a language like Chinese, where most of the words are single syllables, could probably speak a lot faster than someone speaking, say, German, where the words are often super long.
That's just my mostly uneducated guess, though. It'd be interesting to see some real-world comparisons of this.