I've featured videos of these amazing craft before. It's always hard to get a gauge on the speed of these monsters but at 45 seconds into the following video, Banque Populaire happens upon a cruising catamaran (probably doing 4 or 5 knots under jib only).
Earwigoagin's European correspondent, Romain, was kind enough to translate the French for us provincial Americans;
"The guy in the French Original Version says that they are doing 33 knots and that the leisure catamaran they overtake does maybe 6"
Banque Populaire V a fondo por los alisios from Viento a Favor on Vimeo.