Maybe easyJet could start doing what we do with delayed inbound flights needing a fast turnaround - asking the passengers themselves to cross their seatbelts on getting up out of their seats to leave the aircraft? Usually as part of the landing announcement there'll be a small addition along the lines of "Due to our 25 minute turnaround here in XXX, the crew would appreciate you helping us to maintain our on-time performance. If you have any rubbish on you that you didn't give to us when we came through the cabin, could you please leave it on the seat when you get up and cross over the seatbelt. Your assistance is greatly appreciated." Cheesy, but saves a minute or two.