I was in Frankfurt 3 months ago - arrived 1 and 1/4 hours before flight time - was in security queue for at least an hour and ended up missing the flight. I had to take a train to Cologne to get to Dublin via London - all paid for by Lufthansa but missed my best mates wedding ceremony because of it.
Haven't been back since, so not suprisingly - I'm not a fan of that airport
AGOW