How to speed up the callbacks executions in a masked S-Function?

Hi, I created a block in Simulink with a mask with about 600 parameters with various callbacks to change the visualization, but when I open the created block it takes too long to open. Then when I tried other blocks from the Simulink library browser they are much quicker even with the same number of parameters.

There are any way to control the callbacks calls? For example, executing only some callbacks and not all of them on initialization and on closing of the mask. What does effect the time of opening of the model?

Thank you, André Morais