Even though entering their maiden European campaign, Crystal Palace are learning very quickly. Without star figures like forward Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles left Dublin with a commanding win that virtually secures them a place in the Europa Conference League qualifying rounds.
A further three points in their upcoming fixture against Finnish KuPS should be sufficient to secure straight entry to the last 16, particularly following a prior setback against Strasbourg.
This occasion provided a platform for some of Palace's lesser-used talent to impress. Christantus Uche, making only his second start after arriving on loan from Getafe, notched the scoring with a clinical finish. Striker Eddie Nketiah contributed a another, finding the net for the second game in succession.
A Shelbourne side that had finished their league season were outmatched against a mostly rotated Palace outfit. The Londoners were further depleted by the news that Mateta and Muñoz are out with leg injuries.
Despite torrential rain in Dublin, Palace quickly took control. A slick passing sequence in the 11th minute, sparked by Daichi Kamada's incisive pass, allowed Nketiah to lay on Uche for a straightforward finish.
Midfielder Adam Wharton went close minutes later, fizzing a long-range effort over the bar. Nketiah subsequently appealed for a penalty after racing into the area, but the official dismissed the appeals.
The formerArsenal striker did not have wait long to get his goal, prodding home from a yard out after Uche's effort had hit the post.
The home side were clinging on for dear life. Full-back Kameron Ledwidge was lucky to avoid a booking for a couple of robust challenges on Yeremy Pino, before Chris Richards rattled the crossbar with a header from a corner.
The contest was effectively over eight minutes before half-time. Yeremy Pino meandered past some comically weak challenges before calmly dispatching a shot past keeper Wessel Speel to make it 3-0.
After the break, manager Oliver Glasner took the chance to rest several individuals like Kamada and Wharton. Replacement Romain Esse almost scoring with his very first touch, but saw his effort blocked.
Esse was desperately unlucky later on, seeing one attempt strike off each posts before being clasped on the line. Uche also blazed a glaring chance, indicating there is still scope for development in his game.
The only worry for Palace was a late injury to Justin Devenny, who limped off. This allowed 17-year-old striker Benji Casey to earn his first-team debut, rounding off an otherwise perfect evening for the visiting side.