Simulation on Simulink 2019b is too slow !

Hello, everyone,

I am facing a problem with the new version of Matlab Simulink 2019b.

My model used to take about 2 hours to perform a simulation over a period of time on Simulink 2019a .

Now, after installing 2019b, it takes 26 hours which is very annoying and slows down my progress.

I checked with the same model by pasting it in a file 2019a and another file 2019b then running a simulation, it is the version that is the problem.

The model parameters are the same (Simulation time, solver, sampling time...).

Someone could help me to overcome this problem.

Thank you in advance.

[Jeremy Dalton]

I'm seeing the same kind of slowdown. The simulation data inspector is incredibly slow to display data and unreliable too. It will sometimes take 20 minutes to display the data from a single simulation run or crash (requiring MATLAB to be closed and re-opened) whilst trying to display a single data item.

[Paal Skjetne]

Same problem, just running a simple vector assignment takes forever or loading a file.

Problem occured once I upgraded to 2019b.

[Ihab]

In my case, it was the "Simulink Profiler" that slowed down the simulations. Everything is back to normal when I turned it off. Make sure you unchecked it in DEBUG\Performance advisor\Activate Profiler.

Answer 1

[Steven Lord]

It's going to be difficult if not impossible to determine the cause of the slowdown without additional information. I recommend sending the model that has slowed down so much to Technical Support for investigation. You can contact Support using the telephone icon in the upper-right corner of this page.

[Hans Jensen]

has this issue been solved ? The Simulation Data Inspector slows down to zero speed after one run. It was perfect in 2018, which I upgraded from. I applied some commands, since the 'overwrite previous run' option was no longer abvailable in 2020a.