Dave Gerr, N.A., spends a chapter or so in his book, The Nature of Books, analyzing the allege speed difference between light an heavy sailboats, IIRC. If somebody wants an expert's view on this question, I can suggest his book.
The Nature of Boats, Dave Gerr, Book - Barnes & Noble
Over all the book is excellent on variety of both motorboat and sailboat issues.
* * *
Biography
Dave Gerr (rhymes with “bear”) is a naval architect who designs both yachts and commercial vessels. Gerr Marine has been in business since 1983 and has designed everything from dinghies to 60-foot around-the-world racing sailboats, an 82-foot aluminum voyaging motoryacht, and currently, redesign work on the U.S. Navy’s nuclear submarines. Gerr is a contributing editor with Boatbuilder, Yachting, and Offshore magazines. HOMETOWN: New York, NY