Gamultiobj running very slowly

Hello,

Can anyone help me to figure out why gamultiobj does not perform for this constrained optimization model - the model is running but it is extremely slow and does not produce any meaningful results? I tried to change the population size but that does not help, although it seems there are no errors in the functions. I am not sure what I miss in the code or why gamultiobj does not perform for my model. Thanks a lot for help in advance.