Fast up simulink simulation initialization

Hi,

I'm trying to run a simulink model of an MPC using ACADO. All works well.

However, I when I add one more control acction, something weird happens: even if the simulation time requires more or less the same time as before, the INITIALIZATION is slowed down, requiring up to 3 minutes for initialize the model.

Thus my problem is with the initialization, and not with the simulation.

What can be the problem? There is a way for solving it?

(My Matlab version is R2021b, while Simulink version is 10)