Bench Update Finishing Up Takes a lonnnggg time

At a particular AWS installation, bench update goes through relatively quickly, but this part:

Wrote css/frappe-web.css - 65.28 KB
Wrote js/frappe-web.min.js - 137.98 KB
Wrote js/dialog.min.js - 103.08 KB
Wrote css/desk.min.css - 284.59 KB
Wrote css/frappe-rtl.css - 32.37 KB
Wrote js/libs.min.js - 815.22 KB

takes forever. Like 30-45 minutes.

Anybody can comment why? And how to speed up those updates?