Loss of engine power and slow when A/C is on

The car is brand new Nissan Patrol (Armada in the US) it has V8 engine that generates 400 hp and 560 N.M of torque. I purchased it two months ago and it was perfectly fine in the first two weeks, as the car drove close to 2000km I suddenly started noticing heaviness in the car as if something is dragging it back preventing it from accelerating and performing as it should, that was coupled with slight stiffness in the steering wheel. I took the car back to the dealer they did full mechanical, electrical, and OBD check and concluded that the car has no issues. That heaviness sensation was not permanent it kept coming and going sometimes the car will just drive and perform perfect and then suddenly it’ll feel heavy and sluggish. Long story short as the car is close now to 9000km I realized by accident that the heaviness occurs when the A/C compressor kicks in and the car goes back to normal when the A/C is off or the compressor is not running, I have been testing it for two weeks and it’s always the case. The question is how can the A/C compressor affect the performance of this massive engine and why it’s making the steering wheel stiff and what should I do or tell the dealer to repair this issue?