Despite entering their maiden European campaign, Crystal Palace are learning at a rapid pace. Without key figures like forward Jean-Philippe Mateta and wing-back Daniel Muñoz, the London club left Dublin with a comfortable result that all but guarantees them a spot in the Europa Conference League playoffs.
A further three points in their upcoming fixture against Finnish KuPS ought to be sufficient to seal direct passage to the last 16, particularly following a prior stumble against Strasbourg.
This occasion offered a platform for some of Palace's lesser-used talent to impress. Christantus Uche, making only his second beginning since joining on loan from Getafe, opened the scoring with a clinical finish. Forward Eddie Nketiah added a second, scoring for the second consecutive match.
A Shelbourne team that had finished their domestic season proved outmatched even for a largely second-string Palace outfit. The Londoners were already weakened by the news that Mateta and Muñoz are out with leg problems.
Despite heavy rain in Dublin, Palace quickly established dominance. A slick passing sequence in the 11th minute, sparked by Daichi Kamada's incisive pass, let Nketiah to set up Uche for a straightforward tap-in.
Youngster Adam Wharton came close soon after, fizzing a powerful shot over the bar. Nketiah then appealed for a penalty after bursting into the box, but the referee dismissed the protests.
The formerArsenal striker did not have wait long to find his goal, prodding home from a yard out after Uche's shot had struck the post.
Shelbourne were clinging on for dear life. Defender Kameron Ledwidge was fortunate to avoid a booking for two agricultural challenges on Yeremy Pino, before Chris Richards struck the crossbar with a header from a corner.
The match was effectively over eight minutes before half-time. Yeremy Pino meandered past a series of weak challenges before calmly slotting a shot past goalkeeper Wessel Speel to make it 3-0.
Following the break, coach Oliver Glasner took the chance to withdraw key individuals like Kamada and Wharton. Replacement Romain Esse almost scoring his very first touch, but saw his effort blocked.
The youngster was desperately unlucky later on, seeing one shot strike off each posts before being clasped on the line. Uche also missed a sitter of a chance, showing there is still room for development in his game.
A solitary concern for Palace was a second-half injury to Justin Devenny, who limped off. This allowed 17-year-old forward Benji Casey to make his first-team debut, rounding off an otherwise positive night for the traveling side.