Note: This command does not work for Angular 14+ and is only kept for reference. See Best practice Angular 14 production build command for an updated command!
This is the command I use to make production builds of Angular 11+ webapps:
ng build --prod --aot --build-optimizer --common-chunk --vendor-chunk --named-chunks
While it will consume quite some CPU and RAM during the build, it will produce a highly efficient compiled output.