OG Anunoby already was enjoying the finest of his five terrific games since he joined the Knicks, when he strode to the free-throw line in the second quarter Tuesday night with the packed Garden house already loudly chanting his name.

Many athletes would lie and say they tuned out the crowd in that situation, but the instant MSG fan favorite admitted to soaking in the moment.

“I noticed it, I missed my free throws,” Anunoby joked afterward. “It was really cool, though.

“It feels great, just really cool. Great fans. I love it here, I love the fans, it’s awesome.”

Just as the Knicks won their first nine games with Josh Hart in their lineup following his deadline acquisition last February, Anunoby also is having a wildly successful introduction to New York.

Anunoby scored a team-best 23 points on 9-for-12 shooting with four made 3-pointers Tuesday night in the Knicks’ wire-to-wire 112-84 rout of the Trail Blazers. He had another massive two-way impact, finishing plus-26 in 29 minutes to boost his staggering overall rating to a cumulative plus-111 during his 5-0 start with the Knicks since a late December trade from the Raptors.

“If it continued at that level, I would obviously be very pleased,” Tom Thibodeau said of Anunoby with a laugh before the game. “When you come in and you’re in the middle of the season, you’re adjusting on the fly. It’s how quickly can you adapt?

“And I told him that I feel like he’s playing great, just because of the impact that he’s having when he’s on the floor.”

Julius Randle added 20 points, and Jalen Brunson registered 12 with seven assists — with neither playing in the fourth quarter — in a thorough pounding of the rebuilding Blazers (10-26).

Quentin Grimes (17 points), Miles McBride (16) and Donte DiVincenzo (13) also scored in double figures as the Knicks (22-15 overall) improved to 15-1 this season against teams that had posted a losing record entering Tuesday’s action — with their lone loss versus sub-.500 teams coming against the Jazz in mid-December.

“You play those games, and when the year ends, you are looking at seeding and all that different type of stuff, and you don’t want to look at the schedule and say these are the games that got away,” Randle said. “You want to make sure you are taking care of your business.”

Randle added afterward that Thibodeau “cussed us out in practice” Monday and again Tuesday before facing the skidding Blazers.

Whatever was said apparently worked.

Brunson managed only four points in the first quarter, mostly deferring the early-scoring load to Anunoby, who drained four of five 3-point attempts and netted 16 points, as the Knicks raced to a 38-22 lead.

“Just being aggressive, finding the ball being aggressive, hunting shots,” Anunoby said.

“We had good rhythm, and were very aggressive early. I thought the defensive activity to start the game was really good,” added Thibodeau, whose team allowed its fewest points this season.

“The challenge when you bring in someone new is how quickly everyone can adapt. I think in both cases [after the Hart and Anunoby deals] we were playing well before the trades were made.

“Each day [Anunoby] is more comfortable. He’s putting a lot of time in, great worker, very serious in his approach. … He’s done a really good job, and we have a number of guys like that.”

McBride and Grimes came off the bench and drilled two 3-pointers apiece in the first half, combining for 14 points as the Knicks extended their advantage to 63-41 by intermission.

Brunson and Randle finished the half with 10 points apiece, and Anunoby added one free throw in the second to match his previous high of 17 with the Knicks, who led by as many as 39 in the third.

“I think we’re all finding the open man … finding shooters,” Randle said. “It was good to see OG really get in a rhythm tonight.

“We were searching him out, and we’re gonna need that. Obviously, he allows a lot of spacing on the floor, but we just need him to OG. Attack, shoot the shots when he’s open. Attack when he feels he needs to be aggressive. To see him aggressive like that was really good.”