howard,during the day when they got most passengers on they slow down.when asked why we are told its a fuel saving thingy.all 3 seafrance ferries and the new p&o ferry are capabale of doing the crossing in under an hour.dfds [ex norfolk line] have told to slow down to save fuel,the dfds ferrys used to dover to dunkirk in 1 hour 45 its now 2 hours 15.i hope that answers your query.
ps.the molilere is first class on the passenger front,shame they are not taking foot passengers.