As already explained in other posts, the big performance hit happened from SU2 (zero impact) to SU3 (big impact), SU4 has IMPROVED compared to SU3, but it's not at the same level at it was with SU2.
Nothing we can do from our side, of course, the only thing that changed was the simulator, and we are already using the most 2024 native way to attach objects to another object, in MSFS 2024, IF the airplane is a native MSFS 2024 airplane.