Wenger praises Giroud's display.
Arsenal capitalised on Manchester United's defeat to go third in the Premier League table with a 2-1 win over Alan Pardew's side on Saturday.
Olivier Giroud scored the second goal just before half-time, after Santi Cazorla gave the Gunners the lead from the penalty spot in the eighth minute.
The Eagles scored in the dying minute through Glenn Murray but they didn’t have enough to get a comeback.
However, Wenger heaped praise on his inform striker saying he has improved a lot.
“He had an important part in a game as direct as that, to keep the ball, to close them down,” Wenger told Arsenal Player. “Overall he had a great contribution. I’m happy for him.
“[Between] when I brought him here, and [when] you look at him today, I think there’s a hell of a difference.
“That’s credit to him - to the player he was and the player he is today, plus credit for his whole season, where he has worked very hard. I think there’s still room for improvement for him.”
The French boss was also delighted with his team's character and commitment during the tie at Selhurst Park.
“Yes, it was hard-earned,” he said. “You need to earn your points in the Premier League and I think we did it in a convincing way, even if at the end it was a bit dodgy.
“We did fight and play, and today fighting without playing wouldn’t have been enough, and playing without really fighting wouldn’t have been enough either. They put in what was needed.”