There are many reasons the boat speed could be higher instantaneously. Momentum from a earlier gust or catching a wave are two I can think of off hand.
Not sure why we are hell bent on trying to prove Jeff_H wrong. Fighting a losing battle in this case.
There are many reasons to love our beautiful old long keeled boats but performance in light airs is not one of them.
I don't think anyone is hell bent on proving Jeff wrong, rather he is hell bent on trying to prove the older full keel designs are all slow and cannot compare with newer designs. I disagree...and that picture was not taken after an earlier gust or after "catching a wave"
Theorizing is all good and well, but sometimes a picture can be worth a thousand words...