In certain airports/flights, where you have to take a bus from the gate to the plane after boarding at the gate counter, 'speedy boarding' can actually work against its intended purpose. This is because you'll end up boarding the bus first, and if you choose to take a seat rather than standing close to the doors, everyone else will leave the bus before you to board the plane. I've seen this happening countless times.
At Berlin airport, boarding (at least in the low-cost terminal) works by checking tickets and moving passengers to a closed area with few or no seats. And they do not open the actual boarding (with the bus) until everyone is in that area. So the so-called "priority" passengers are the first to be in that area, standing and waiting for everyone else to fill that area.
