CLEVELAND — Chants of “New York Sucks” bounced off the walls of a deafeningly loud Rocket Mortgage FieldHouse on Tuesday night.

The Cavaliers were up 20 points, and it wasn’t even halftime yet.

It didn’t get much better for the Knicks over the final 24 minutes of a one-sided playoff beatdown.

Consider Tuesday night a reminder that Cleveland, a heavy favorite entering this best-of-seven, opening-round series, isn’t going anywhere.

The Cavaliers certainly looked like the considerably better team three days after the Knicks had snatched home-court advantage with a thrilling Game 1 victory.

As they promised, the Cavaliers punched back in Game 2 and the Knicks didn’t have any answers.

This was an early knockout, a 107-90 wipeout that was reminiscent of the Knicks’ ugly series loss to the Hawks two years ago.

“We gotta do a better job of punching back,” RJ Barrett said.

Darius Garland was the best player on the floor by a wide margin, scoring 32 points and adding seven assists.

Former Net Caris LeVert rebounded from a poor Game 1 by adding 24 points off the bench.

Donovan Mitchell, coming off his 38-point outburst in the opener, enacted the role of playmaker well, notching 13 assists to go with 17 points.

“At the end of the day we came here and did what we’re supposed to do. We got one on the road,” said Julius Randle, who reported no ill effects from a late hard fall under the basket, the result of a Flagrant 1 foul by Jarret Allen. “In the big picture of things, we have to be positive about that. But obviously got to play a lot better next game.”

The Knicks, who never drew closer than 16 points in the second half, were incapable of counterpunching.

Randle committed six of the Knicks’ 17 turnovers in an ineffective 22-point, eight-rebound performance.

Jalen Brunson (20 points, six assists) shot just 5-for-17 from the field.

Josh Hart, who was questionable to play with a sprained left ankle, was active, but didn’t make much of an impact.

Immanuel Quickley and RJ Barrett’s struggles continued as the two combined to shoot 8-for-21 from the field.

The Knicks were in quicksand, beaten to loose balls all night.

They were a step slow, clearly the less desperate team.

The Cavaliers beat them on the glass by seven and outscored their bench, 36-28 — two areas that were decidedly in the Knicks’ favor in the series opener.

“They were into us, they made us feel [them] right from the start, and we just never adjusted,” Quickley said. “We have to be better for Game 3.”

The Knicks actually started well, scoring 12 of the first 16 points of the game.

It all went downhill from there.

The Cavaliers responded by reeling off 13 of the next 16 points and never looked back.

LeVert hit a 3-pointer with 0.3 seconds left in the first quarter, giving Cleveland momentum that carried over into a dominant second quarter.

The Cavaliers outscored the Knicks 34-17 over the ensuing 12 minutes, ending any thoughts coach Tom Thibodeau’s team may have had of leaving Cleveland with a 2-0 series lead.

It was as ugly a first half as the Knicks had played this season: they committed 14 turnovers, shot 36.8 percent and were consistently outworked.

Thibodeau used two timeouts in the first 5:58 of the second quarter, but could not slow the Cavaliers’ momentum.

“I think that was the game right there,” Barrett said.

Whatever could go wrong did for the Knicks.

There were miscommunications at both ends of the floor.

Quentin Grimes hit an unsuspecting Hart with a pass in the back.

Randle turned the ball over in the backcourt.

Obi Toppin tried to save a ball going out of bounds and it went right to Allen, who was standing under the Knicks’ hoop, for a dunk.

It was that kind of night for the Knicks. The good news is they do own home-court advantage in what is now a five-game series. Maybe a change of location to the Garden will help erase the memory of the bludgeoning.

“Obviously MSG is going to be rocking,” Hart said, “but we’ve got to go out there and execute.”