Swansea 10 Leinster 51
Leinster swept to the top of Heineken Cup Pool Four as they ran in six tries against hapless Swansea at St Helen's.
Destroyer in chief was Brian O'Driscoll, who scored two tries and set up another in a superb all-round display.
He was named man-of-the-match, while wing Gordon D'Arcy also put in a claim with a try treble.
Leinster's other touchdown came from back row forward Aidan McCullen.
Swansea responded when Steve Winn crossed, but the score was no more than a consolation for John Connelly's outclassed side.
Swansea were 37-3 down at the break after one of the worst halves of rugby they have produced in years.
Leinster were 27-0 up in 29 minutes with D'Arcy crossing twice and O'Driscoll also going over.
D'Arcy's first was a magnificent effort set up by a 70-metre burst down the wing from Shane Horgan.
As Swansea struggled to hold their line, play was moved left for Keith Gleeson to send D'Arcy over.
Executing everything at pace, Leinster claimed their second score when O'Driscoll flashed across with a home defence stretched to the limit.
Swansea were off the pace and making a glut of basic errors.
D'Arcy turned the screw with another touchdown after O'Driscoll kicked to the flag.
The humiliation continued with O'Driscoll touching down for a try in first-half injury time.
Swansea tightened up in the second half but were unable to salvage their pride.
PA