Leinster head coach Matt O'Connor believes his side have to learn a great deal from their Zebre win ahead of taking on the Ospreys next Friday.
Zebre held an 8-3 lead at the break in Dublin before the Irish side clicked into gear and ran in four second-half tries to claim the Guinness PRO12 win.
But boss O'Connor knows they cannot afford such a slow start in Swansea.
"There's a lot of things that we can be better at. The learning will be steep but it has to happen by next Friday," he told PRO12rugby.com.
"We had several opportunities to score in the first half that we didn't take, that kept them in the contest and kept them semi-interested.
"The second-half performance was a little better but there were a lot of errors that played into their hands and their ability to slow the game down."
O'Connor singled out praise for Fergus McFadden, Luke Fitzgerald and Dave Kearney, saying that international appearances can't be far away.
"They're test standard players and they will be in the mix pretty soon," he said.
"Ferg, Luke and Dave are very, very close to being in the mix.
"I wouldn't be surprised if there are injuries over the next couple of weeks with Ireland, that those blokes will be playing."