Oscar and Frank Lampard goals won the game for Chelsea just before the break to extend the Swans' winless run to six games.
"I didn't think we suffered for the first 40 minutes," said Laudrup, who bemoaned his side's lack of cutting edge in the final third.
"Five crazy minutes, two goals, changed the game completely."
Laudrup's side beat Chelsea en route to lifting the Capital One Cup and they have one win since their Wembley triumph over Bradford in February.
He added: "We've not had a very poor game since the cup.
"We've had moments where we've not played well, but even today, you can't say we played poorly after 60 minutes.
"We just had those crazy five minutes."
Lampard, a first-half substitute for Rafa Benitez's men, edged closer to becoming the club's record goalscorer and Laudrup had nothing but admiration for the midfielder.
"When you have quality, you will always have it," the Dane said. "The thing is, even if we don't want to admit it, we all get older.
"Sometimes the pace is not the same, you can't do exactly the same things, but the quality is always there.
"We know Frank Lampard, the quality he has. Always coming there, from the second line into the box, so difficult to mark. He's scored so many goals."