Simulation is not running in real time due to excessive CPU load.

This means that the simulation is taking longer to run than real time because your CPU is struggling to keep up with the demands of the simulation. There are a few things you can try to reduce the CPU load:

1. Close any unnecessary programs or applications running on your computer.
2. Lower the graphics settings of the simulation to reduce the demands on your CPU.
3. Upgrade your computer's hardware, such as adding more RAM or upgrading your CPU, to better handle the demands of the simulation.
4. Optimize the simulation code to make it more efficient and reduce the workload on your CPU.

If none of these solutions work, you may need to consider using a more powerful computer or a different simulation software that is better optimized for your system.