How to reduce angular application build time?
Copied Answer From : https://github.com/angular/angular-cli/issues/17874#issuecomment-640568824
ConcatenateModules is used for scope hoisting, which results in 2 things, smaller bundle sizes and faster code execution in the browser.
If really want to disable concatenateModules which is not recommended you can use ngx-build-plus.
From a CLI point of view, exposing a way to disable concatenateModules is out of scope, because we wouldn't like users to opt-out from key runtime performance and bundle size optimisations.