More Security at the gates

During my last trip to Washington, I experienced a higher level of security at the Americans airports.
American citizens were really annoyed by the time it take to pass through the security checks, especially the youth.
Anyway, it is not big deal, just try to make it a little bit early to the airport to prevent missing your plane. Last time, I was the last one to board.
Frankly, I arrived to the airport very late, almost 20 minutes before the flight!