Summary

It seems that the BlockInitialization MATLAB function takes a lot of time to execute in some models, impacting a lot the time necessary to start a simulation.

Motivation

Profiling in some Simulink models that use WB-Toolbox revealed that during Simulink model compilation ( https://de.mathworks.com/help/simulink/ug/simulating-dynamic-systems.html#f7-8245 ) . In particular, it seems that the part that costs more in term of time is the following loop:

, that takes ~100 ms for each iteration, and perform an interation for each nesting level of the block, arriving to a time ~1/2 seconds for really nested models, and a total compilation time of ~1 minute for a model with a lot of WB-Toolbox blocks.

Additional context

Further profiling to understand which line of

takes so much time may be needed.