As far as I can recall, FRA T1 has always been quite painless. But FRA T2... my goodness...
It is clear that FRA2 having security at the boarding gates just does not work. I have had so many close shaves, typically when I have an empty BA flight to LHR or LCY to get on and the security is being shared with a fully packed Asian flight and the priority lane being closed. The longest to get through was around an hour, and the queue was not very long but the staff were so slow.
By the way, what is the Cathay Pacific lounge like? The JAL one is always packed and tends to have a poor selection, and the Luxx lounge really does not live up to the name (and is in the wrong terminal).