If MUX block have more than 40 inputs, so is there any alternate way or optimization available in Matlab Simulink for MUX block

Hi all, I have to use 40 values at one instant from input matrix (of size 16800 * 1). For this I have used MUX block. But using MUX, model becomes complex. So is there any alternate way to use MUX block. Thanks in advance.