Hurry up and sidddown
A family member flew Jet Blue yesterday a.m. - ROC/JFK. Flight was on time w/departure and arrival. During the boarding process my relative said she never has seen this to such an extent - the flight attendants kept encouraging the passengers to: "Hurry up and get out of the aisles and sit down." "The sooner everyone is seated the sooner we can go." "Hurry everyone, we really need you all to get out of the aisles and sit down.". Also the pilot came on the speaker system 3 times and (nicely) requested that the passengers get out of the aisles and quickly sit down.
My family member said it really was pretty comical to watch how clueless and slooooow some of the passengers were, so she was happy the flight crew stepped in to push things along. When looking for ways to improve an on-time record, start with planting passengers in their seats ASAP - I like it!