Fastest boarding I've ever seen was on Domestic Routes in Korea because:
1. Everything was usually bang on time.
2. No boarding cards as such - just a paper slip for the Bar Code reader... beep-beep-beep.
3. Nobody carried huge amounts of bags into the cabin - didn't need to since the bags usually made the carousel before you did... pop your stuff under the seat or in the overhead... click-click-click
4. Everyone sat down quickly, nobody got in other people's way, courtesy personified.
5. Doors closed - push back.
A few minutes beginning to end...
