More musing on reviewing

I found this interesting post from FemaleScienceProfessor, who has (as a journal Editor) conducted some informal research into the time taken to review papers, in reviewers sorted into groups by seniority.  In general, early career and retired scientists are the fastest reviewers, with some outliers.  Individual reviewers tend to be consistent in the time taken to review:

I thought there would be more variation because the time frame might be affected by how busy someone is, as well as factors related to the manuscript length and quality: some manuscripts are easy to review and some require a huge amount of time. But no.. time-to-review seems to be a personality trait more than anything else.

From my own experience as an Editor soliciting reviews I would entirely agree with this.  And, as a reviewer, I almost always return reviews before the deadline, irrespective of how busy I am or how difficult the paper.