Computation speed Isaac Sim 2022 vs Isaac Sim 2023 (anim.people)

I am trying to simulate a bigger crowd (50 -100 people) in isaac using the anim.people extension.
Due to the incompatibility of the nvidia 535 graphics driver I was forced to use the newest version of isaac sim (2023.1.0).
I noticed that if I load the exact same scene with the same command file, the newest version is significantly slower then the previous one (50-70 FPS on isaac sim 2022.2.1 vs. 10 - 12 FPS on isaac sim 2023.1.0), additionally the loading time to load all assets is also 10x slower.
With neither version I have detected any CPU or GPU bottlenecks.

Are there any additional improvements required to keep a similar computational speed?

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