Sure, the Knicks had played poorly entering Thursday game in Brooklyn. But the Nets’ offensive performance wasn’t just poor, it was historically bad — the worst the NBA had seen in years.

The struggling Knicks trudged into the Barclays Center in the basement of the Atlantic Division and in the midst of a three-game losing skid. They sauntered out with a 94-82 rout, bludgeoning Brooklyn before a sellout crowd of 17,732 in its own building.

“Our guys played with great energy. I thought we really had great focus,” said Knicks interim coach Mike Miller, adding, “I really felt like we did a good job with how we started making them go through us to make some plays.”

The Nets’ scoring output was their lowest of the season. Their horrid 26.9 percent shooting was far worse than that.

“We shot 27 percent. … We played really, really bad. Like, laughably bad,” said Spencer Dinwiddie, who had a team-high 25 points but got little — rather, make that no — help from his teammates. “We shot really bad, probably historically bad.”

Oh, it was deep in the wrong kind of history. The Nets (16-14) hadn’t shot that poorly since they hit just 26.8 percent on Dec. 5, 2000, according to Elias Sports Bureau. No team in the entire NBA had shot that poorly since Orlando on Jan. 23, 2012.

“See, we almost set a record,” Dinwiddie said. “That’s not good.”

It was downright bad. Brooklyn had beaten the Knicks (8-24) twice, and gone 12-6 since losing Kyrie Irving, but Thursday they got thrashed.

Mitchell Robinson’s putback put the Knicks ahead 77-54 with 2:01 left in the third quarter, and the fourth was garbage time.

Julius Randle poured in a game-high 33 points and eight rebounds, while Marcus Morris had 22 points and eight rebounds. But it was the Knicks defense — or the Nets offensive malaise — that turned this one-sided.

“The communication was the biggest thing, guys on a string,” Morris said. “We were finding shooters, we know who were trying to find and what we were trying to take away.”

They nearly took away everything, holding the Nets to 13 of 50 from 3-point range. Taurean Prince was 1 of 10 — all from deep. He had one drive and got whistled for a charge. Yeah, it was that kind of night.

As soon as the Nets took an early 13-9 lead, their ball movement went in the tank and took the offense with it.

Brooklyn allowed a 15-2 run, missing a dozen straight shots and had five turnovers to close out the first quarter. The Nets were 0-for-6 with three turnovers after Dinwiddie sat down with 3:47 left in the period.

“When we started missing the ball stopped moving. Then we stopped taking open shots when the ball stopped moving … there was too much ball holding, didn’t move it side-to-side,” Kenny Atkinson said.

“It affected our morale, it affected our spirit, it affected our physicality. That’s the difference between an average team and a really good team, and they brought us down to average.”

Below average. Their eight 2-point field goals were the fewest by an NBA team since Nov. 22, 1950, when the Lakers and Pistons each made four, according to Elias Sports Bureau. That was in the pre-shot clock era, in a game Fort Wayne won 19-18.

The Nets were that bad Thursday.

They briefly took the lead at 39-38 on Prince’s 3-pointer, his only bucket. But it was fleeting. Randle sent the Knicks into the locker room with a 46-41 lead. And they came out of the break on fire as well, with Morris stretching that to 62-45.

Morris’ three-point play made it 69-49 with 4:29 left in the third quarter, and Robinson’s putback padded the lead to 23.

“I think we were all searching for our shot, that’s the most political way to put it,” Jarrett Allen said. “I think we could’ve moved the ball more, but at the end of the day we were all frustrated.”

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