If you read their documentation, then you see that what they are referring to, is when they run 30k instances in parallel.
"Now, let’s turn off the viewer, and change batch size to 30000 (consider using a smaller one if your GPU has a relatively small vram):
...
Running the above script on a desktop with RTX 4090 and 14900K gives you a futuristic simulation speed – over 43 million frames per second, this is 430,000 faster than real-time. Enjoy!"
"Now, let’s turn off the viewer, and change batch size to 30000 (consider using a smaller one if your GPU has a relatively small vram): ...
Running the above script on a desktop with RTX 4090 and 14900K gives you a futuristic simulation speed – over 43 million frames per second, this is 430,000 faster than real-time. Enjoy!"
https://genesis-world.readthedocs.io/en/latest/user_guide/ge...