Even though entering their maiden European campaign, Oliver Glasner's side are learning very quickly. Without star figures like striker Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles left Dublin with a commanding result that all but secures them a spot in the Europa Conference League qualifying rounds.
Another three points in their next fixture against Finnish KuPS ought to be sufficient to seal direct entry to the last 16, particularly after a prior stumble against Strasbourg.
This occasion provided a chance for several Palace's lesser-used talent to shine. Christantus Uche, in only his second beginning since joining on loan from Getafe, opened the scoring with a clinical finish. Forward Eddie Nketiah contributed a second, finding the net for the second consecutive match.
A Shelbourne side that had finished their domestic season proved outmatched against a largely second-string Palace outfit. The Londoners were already weakened by the reports that Mateta and Muñoz are out with knee problems.
In spite of heavy rain in Dublin, Palace rapidly took control. A flowing move in the 11th minute, initiated by Daichi Kamada's incisive pass, let Nketiah to set up Uche for a simple tap-in.
Youngster Adam Wharton came close soon after, fizzing a powerful shot over the bar. Nketiah subsequently appealed for a penalty after bursting into the box, but the official waved away the protests.
Ex-Arsenal man didn't need to wait long to get his goal, prodding home from a yard out after Uche's shot had hit the post.
The home side were clinging on for dear life. Defender Kameron Ledwidge was fortunate to escape a booking for two robust tackles on Yeremy Pino, before Chris Richards rattled the woodwork with a header from a corner.
The match was as good as over eight minutes from half-time. Yeremy Pino weaved past a series of comically weak challenges before calmly dispatching a shot past keeper Wessel Speel to extend the lead to 3-0.
After the break, manager Oliver Glasner seized the opportunity to withdraw key players like Kamada and Wharton. Replacement Romain Esse almost scoring with his first touch, but saw his shot blocked.
The youngster was desperately unlucky later on, seeing one attempt crash off both posts before being gathered on the line. Uche then blazed a sitter of a chance, indicating there is still room for development in his game.
The only worry for Palace was a second-half injury to Justin Devenny, who was forced off. This allowed 17-year-old striker Benji Casey to make his first-team debut, rounding off an otherwise perfect evening for the traveling side.
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