Despite entering their first-ever continental campaign, Oliver Glasner's side are adapting at a rapid pace. Missing key players like striker Jean-Philippe Mateta and wing-back Daniel Muñoz, the London club left Dublin with a commanding result that all but secures them a place in the Conference League playoffs.
A further three points in their next fixture against Finnish KuPS ought to be enough to seal straight entry to the knockout stages, especially following a prior setback against Strasbourg.
This match provided a chance for some of Palace's fringe talent to shine. Christantus Uche, making only his second beginning after joining on loan from Getafe, notched the account with a clinical goal. Striker Eddie Nketiah contributed a another, scoring for the second consecutive match.
A Shelbourne team that had finished their league season proved outmatched even for a mostly rotated Palace lineup. The visitors were further depleted by the reports that Mateta and Muñoz are sidelined with knee problems.
In spite of torrential rain in Dublin, Palace rapidly established dominance. A flowing move in the 11th minute, initiated by Daichi Kamada's incisive pass, let Nketiah to lay on Uche for a straightforward tap-in.
Midfielder Adam Wharton went close soon after, driving a long-range shot over the bar. Nketiah subsequently appealed for a penalty after bursting into the area, but the official waved away the protests.
Ex-Arsenal striker did not have wait long to find his goal, tapping home from a yard out after Uche's shot had hit the post.
The home side were hanging on desperately. Defender Kameron Ledwidge was lucky to escape a booking for two agricultural challenges on Yeremy Pino, before Chris Richards struck the crossbar with a header from a corner.
The match was as good as over eight minutes from half-time. Yeremy Pino meandered past some weak challenges before coolly dispatching a shot past goalkeeper Wessel Speel to make it 3-0.
After the break, coach Oliver Glasner took the chance to rest key individuals like Kamada and Wharton. Substitute Romain Esse almost scoring his first touch, only to see his effort blocked.
The youngster was desperately unlucky later on, seeing one attempt crash off each posts before being gathered on the line. Uche also missed a glaring chance, indicating there is still room for improvement in his game.
A solitary worry for Palace was a second-half injury to Justin Devenny, who limped off. This paved the way for 17-year-old striker Benji Casey to earn his senior debut, capping an otherwise positive night for the traveling side.