Simulink: simulation speed slows down when window is not in foreground

I have a simulink model that is used to simulate an electric drivetrain of a electric vehicle. It is meant to simulate 1800 seconds with a sample rate of 1 microsecond. According to my extrapolations, it should take 4-6 days to finish.

However, I realised something strange. When I change from the Simulink window to another application (Simulink runs in the background) the simulation speed of simulink drops significantly, approximately to 15 % what it is when I have the Simulink window in the foreground. This is also evident from the fan of the notebook, it drops in speed significantly when Simulink is in the background.

Anyone has a clue how I can change the settings so that Simulink always runs with full power?

[Christian Hanzl]

Does anybody has some clue?

The simulation is running in accelerator mode.

[Paul]

Sounds like something about which you may want to contact MathWorks Technical Support.