How to accelerate the loading speed of constraints?

[Sswd]

"As shown in the figure, I am using a multi-layer nested for-loop to load constraints. There are more than a dozen programs like the one shown, and it takes more than an hour to load before the solver starts solving. I tried using the parfor loop method to solve this issue, but after testing and browsing through your relevant answers, I realize that this is not feasible. I would like to ask if there are any methods to resolve this issue?""The number of constraints is approximately fifty to sixty thousand."

[johanlofberg]

You will have to vectorize it massively