The sim's frame rate is very low

I followed this tutorial to perform the simulation, but the actual frame rate of the sim is very low. I can see the image in RViz but I can’t see the mapping effect. Could you please tell me where I’ve set it up incorrectly?

This is the result from the official tutorial, and it seems quite different. I want to know where I went wrong.

https://media.githubusercontent.com/media/NVIDIA-ISAAC-ROS/.github/release-4.0/resources/isaac_ros_docs/repositories_and_packages/isaac_ros_nvblox/isaac_sim_nvblox_nav2.gif/

The problem was solved after replacing it with a high-performance device.