Yes, some scientists can think and write pretty fast while others are much slower. Software created for the Dark Web Project of the Artifical Intelligence Lab U Arizona can measure that and identify an author by typing patterns – a rather old technique already in use during world war II for recognizing radio operators. In addition blogs + scientific papers are excellent for semantic network analysis as an individuals use only a limited number of words or are doing always the same typing errors. You don’t believe that? Click on the thumbnail
In physics, power is defined as amount of energy expended for a given unit of time. This is quite different to measurement of impact in science as it doesn´t matter if if takes you 3 weeks or 3 years to write up a paper.