2019a slower then 2017a

Hi,

I have a model with some S-functions.

When I run my model in 2017a it takes 219 seconds (using tic; sim('modelname'); disp(toc))

When I run the same model in 2019a (using the same s-functions) it takes 284 seconds.

This is 30% slower!!

In both cases I run my model with accelerator mode and in both cases I run my model once before to make sure the compiuling is not cvreating a longer run.

To make sure it was exacly the same model I exported the 2019a model to 2017a.

Could somebody help me why 2019a would be slower then 2017a? 30% is really a lot!

Tom Wambecq