We received a message from Easyjet several hours before our return flight from Geneva to Luton stating "There may be delays at the airport security control before your flight and we recommend that you arrive at the airport 3 hours before your flight time". Despite the late notification we were able to amend our transfer in order to arrive 3 hours before the 20:25 departure time. On arrival at Geneva Terminal One there was complete chaos, with people queueing throughout the entire terminal building, outside the terminal building and for around 300 metres beyond the terminal building and past the railway station. There was mass confusion and it took a considerable time to find a member of Easyjet staff who admonished us for even entering the terminal building and curtly told us to go to the back of the queue, outside and way off in the distance. The queue was nothing to do with "airport security control" which was more or less deserted when we got there after over 3 hours of queueing. Easyjet know how many flights they are operating, how many passengers have booked, how many bags those passengers have checked in, and which Covid checks need to be carried out, so it beggars belief how they can manage to under resource the check in so badly that it brings the entire terminal to a chaotic standstill. Easyjet and airport staff had to route the queue through multiple areas, create multiple crossing points to allow passengers from other airlines to access desks, entry / exit points, toilets and departures. This included routeing the queue in multiple directions in narrow corridors requiring other passengers to use, so social distancing was completely impossible. Of course all Easyjet fights were severely delayed, as it was impossible for any passenger to arrive 2 or even 3 hours ahead of their scheduled departure and have any chance of making the flight. After 4 hours in (and outside of) the airport we eventually made it to our flight which had itself been delayed by 1 hour 45 minutes. The flight crew advised they had sat for 90 minutes without knowing what was happening as nobody was answering the company phones or radio calls. There is no excuse for causing such misery for thousands of people and such chaos to an airport, please think very carefully about choosing Easyjet, particularly via Geneva.