Same problem with me.

i departed CYYZ frames were at 60 (have them locked at 60),when arrived at KORD the frames were already down to 32.

MFS2024.

9950x3D

RTX 5090

64gb 

So is Inibuilds actually going to do something about this?

I have found out, that if I delete all the aircraft's folders and configs, the aircraft briefly performs miles better, but the FPS then just drop to their usual 30s to 40s. In a completely the same scenario, I have 50 - 60 FPS in PMDG 777.

Sorry, but this is just bad optimization.

And I would like to stress, that this is on SU4.