Matrix multiplication in simscape leads to very long compile time in simulink. Possibility to accelerate?

I have to compute a matrix multiplication. The dimension of the matrices is 15x15. For testing purpose I created a simscape component with two matrices A and B in the parameter part and a matrix C in the variable part; all dimension 15x15. In the equation part C==A*B; is computed.

If I run a simulink model using this component it stays at "Compiling : Evaluating Block Parameters : Completed" for several minutes. For small matrices it is fast.

Why is the compile time so long and is there a possibility to accelerate it?

Thank you for answers!