Today, my flight from LHR arrived at the stand in 2F at 09:15 iso 09:00.
I cleared immigrations and walked (fast) to the very end of 2D (lower level desks).
Made it to the desk with 10mn to spare (09:30) before closing time of my next flight (NON REV ticket= no through check).
That's 15mn from my seat on the aircraft parked at one end of CDG to c/in at the other end.
Should I be proud of my achievement?

On the topic of immigration: it is really a joke. The officer manning the ACCESS 1 line did not check a single passenger for the whole time I waited in line but never called any other passenger over, leaving just 2 of his colleagues deal with quite a large number of people. Worse thing is that you can't even say anything like you would do to anyone else working in the private sector.