Even though embarking on their first-ever continental campaign, Oliver Glasner's side are adapting at a rapid pace. Missing key players like forward Jean-Philippe Mateta and wing-back Daniel Muñoz, the London club left Dublin with a commanding win that all but secures them a spot in the Conference League playoffs.
Another victory in their upcoming match against Finland's KuPS ought to be enough to seal straight entry to the knockout stages, particularly after a prior setback against Strasbourg.
This match offered a chance for several Palace's lesser-used players to shine. Christantus Uche, in only his second start since joining on loan from Getafe, notched the account with a well-taken finish. Forward Eddie Nketiah added a another, finding the net for the second consecutive match.
A Shelbourne team that had finished their domestic season were outmatched against a largely second-string Palace lineup. The Londoners were already weakened by the news that Mateta and Muñoz are sidelined with leg injuries.
In spite of torrential rain in Dublin, Palace quickly established dominance. A flowing move in the 11th minute, initiated by Daichi Kamada's clever pass, allowed Nketiah to set up Uche for a straightforward finish.
Youngster Adam Wharton went close soon after, driving a powerful shot over the bar. Nketiah subsequently appealed for a penalty after bursting into the box, but the official dismissed the appeals.
Ex-Arsenal striker didn't need to wait long to get his goal, tapping home from a yard out after Uche's effort had hit the post.
The home side were clinging on desperately. Defender Kameron Ledwidge was lucky to avoid a booking for a couple of agricultural challenges on Yeremy Pino, before Chris Richards rattled the woodwork with a powerful header from a corner.
The contest was as good as over eight minutes before half-time. Yeremy Pino weaved past some comically weak challenges before calmly slotting a shot past keeper Wessel Speel to make it 3-0.
Following the break, manager Oliver Glasner took the chance to rest several players like Kamada and Wharton. Replacement Romain Esse almost scoring with his very first touch, but saw his effort blocked.
The youngster was desperately unlucky later on, seeing one attempt crash off each posts before being clasped on the line. Uche then blazed a glaring chance, indicating there is still room for development in his game.
A solitary worry for Palace was a second-half knock to Justin Devenny, who was forced off. This paved the way for 17-year-old forward Benji Casey to make his senior debut, rounding off an otherwise positive night for the visiting side.