Panarin extended his goal streak to four games at 17:20 off a pass from the left corner by David Savard to make it 3-0.
Panarin has seven points (five goals, two assists) in the past three games and 18 points (nine goals, nine assists) in the past 12 games.
Tortorella said Panarin, who has 52 points (18 goals, 34 assists) and can become an unrestricted free agent July 1, has not been distracted by his contract situation.
"He approaches the game as he always has," Tortorella said. "For a little bit here, he had a little bit of a dip as far as winning the battles where we're so accustomed to seeing him win most of his battles.
"He's found it again. I just think he enjoys playing. I believe him. I don't think he knows what he's going to do, but we can't do anything about that. We're just going to go about our business."
Dubois extended the lead to 4-0 on the power play at 1:45 of the second period, after Korpisalo made a save on backdoor shot by Boyle on a Devils power play.
"I'm pretty comfortable," Korpisalo said. "The way we're playing right now it's pretty easy to play behind them. Today I don't think there were really any dangerous shots. They just cleared the pucks in front of me, blocked shots, which made me confident."