Angular's ahead-of-time (AoT) view compilation was up until Angular 4 generated a considerable amount of boilerplate that could result in considerably larger than expected application file-size. However, thanks to updates to the view engine in Angular 4. You can now enjoy considerably more optimized views with smaller file-sizes.

This upgrade is a replacement for the existing view engine and comes with no configuration changes or updates needed to your Angular application to take advantage of the enhancement. Google touts that many developers will see over 60% generated file-size savings over the previous generation of Angular's view engine. Those file-size savings can directly translate into a faster loading web application user experience in your application.