Even though entering their maiden European campaign, Crystal Palace are adapting at a rapid pace. Without key players like forward Jean-Philippe Mateta and defender Daniel Muñoz, the London club left Dublin with a comfortable result that all but secures them a spot in the Conference League playoffs.
Another three points in their next match against Finnish KuPS should be sufficient to secure straight passage to the knockout stages, particularly following a prior setback against Strasbourg.
This occasion provided a chance for some of Palace's lesser-used talent to shine. Christantus Uche, making only his second beginning after joining on loan from Getafe, notched the account with a clinical goal. Forward Eddie Nketiah contributed a another, scoring for the second game in succession.
The Shelbourne side that had finished their league season were outmatched against a mostly second-string Palace outfit. The visitors were already weakened by the news that Mateta and Muñoz are out with knee problems.
Despite torrential rain in Dublin, Palace quickly established dominance. A flowing move in the 11th minute, sparked by Daichi Kamada's incisive pass, let Nketiah to set up Uche for a straightforward finish.
Youngster Adam Wharton went close minutes later, fizzing a long-range effort over the bar. Nketiah then appealed for a penalty after racing into the area, but the official waved away the appeals.
The formerArsenal striker did not have wait long to find his goal, prodding home from close range after Uche's shot had struck the post.
Shelbourne were hanging on for dear life. Full-back Kameron Ledwidge was lucky to escape a booking for a couple of robust tackles on Yeremy Pino, before Chris Richards struck the woodwork with a powerful header from a corner.
The match was as good as over eight minutes from half-time. Yeremy Pino meandered past some comically weak challenges before coolly slotting a shot past goalkeeper Wessel Speel to make it 3-0.
After the break, coach Oliver Glasner seized the opportunity to rest key individuals like Kamada and Wharton. Substitute Romain Esse almost scoring his very first touch, only to see his effort blocked.
The youngster was incredibly unlucky later on, seeing one attempt strike off each posts before being clasped on the line. Uche then blazed a glaring chance, indicating there is still room for improvement in his game.
The only worry for Palace was a second-half injury to Justin Devenny, who limped off. This allowed 17-year-old striker Benji Casey to make his first-team debut, capping an otherwise perfect evening for the visiting side.