How can i process the world model in parallel with multiple CPUs?

I created a .world file, but the real time factor is only 0.3. So I checked the CUP and found that it cannot be processed in parallel with multiple CPUs, as shown in Figure 1. image description In addition, when I uninstalled the Nvidia graphics driver, it can be processed by multiple CPUs, but the real time factor is lower, only 0.12.