Despite entering their maiden European campaign, Oliver Glasner's side are adapting at a rapid pace. Without star figures like forward Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles departed Dublin with a comfortable result that all but guarantees them a place in the Conference League qualifying rounds.
Another three points in their next match against Finnish KuPS ought to be sufficient to secure direct entry to the knockout stages, particularly after a previous stumble against Strasbourg.
This occasion provided a platform for several Palace's lesser-used players to shine. Christantus Uche, in only his second start after joining on loan from Getafe, opened the scoring with a clinical goal. Forward Eddie Nketiah added a second, scoring for the second game in match.
The Shelbourne side that had finished their league season were outmatched against a largely rotated Palace outfit. The Londoners were already depleted by the news that Mateta and Muñoz are sidelined with leg problems.
Despite heavy rain in Dublin, Palace rapidly took control. A slick passing sequence in the 11th minute, sparked by Daichi Kamada's incisive pass, let Nketiah to lay on Uche for a straightforward tap-in.
Midfielder Adam Wharton went close soon after, fizzing a powerful effort over the bar. Nketiah subsequently claimed for a penalty after bursting into the box, but the official waved away the appeals.
Ex-Arsenal striker did not have wait long to find his goal, tapping home from close range after Uche's shot had struck the post.
Shelbourne were clinging on for dear life. Defender Kameron Ledwidge was fortunate to escape 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 match was as good as over eight minutes before half-time. Yeremy Pino meandered past a series of weak challenges before calmly dispatching a shot past keeper Wessel Speel to make it 3-0.
Following the break, manager Oliver Glasner took the chance to rest key individuals like Kamada and Wharton. Substitute Romain Esse came close to scoring his very first touch, only to see his shot blocked.
The youngster was incredibly unlucky later on, seeing one shot strike off each posts before being clasped on the line. Uche also missed a glaring chance, showing there is still room for development in his game.
A solitary concern for Palace was a second-half knock to Justin Devenny, who was forced off. This allowed 17-year-old forward Benji Casey to make his first-team debut, rounding off an otherwise positive evening for the visiting side.
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