Routers loading in express

I'm interested in loading of my routers in nodejs express application. I saw the two approach:

1. The first is loading an all routers in a boot place of application like as the following:

   module.exports = function(app, db) {
         var controllers_path = __dirname + '/app/controllers';
         var controller_files = fs.readdirSync(controllers_path);
   
         controller_files.forEach(function(file){
            require(controllers_path+'/'+file)(app)
         })
      });
   };
   

2. The the second ones is loading of each router in a certain files if needed like as the following:

   require('../controllers/main.js');
   require('../controllers/payload.js');
   

Which approach is better for performance?