This repository demonstrates the difference in initial build times and incremental rebuilds

It contains 2 targets in "architect" section of angular.json: build (esbuild application builder) and wpbuild (webpack browser builder). Simply rename the one you need into build to test it.

Personal observations for simple changes in components (no new imports, only console.logs or html elements added/removed):

esbuild application builder build 34,7s

src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 16,9s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html 12.6 src/app/app0/lib2/childlib0/src/lib/childlib0.module.ts - 13.8s revert changes - 14,7s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 12.3s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 13.7s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html - 11.5s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html - 11.9s

webpack browser builder build 156s

src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 6,2s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html 2,9s src/app/app0/lib2/childlib0/src/lib/childlib0.module.ts - 9s revert changes - 3,4s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 2,7s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.ts - 2,73s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html - 2,3s src/app/app0/lib2/childlib0/src/lib/lib2childlib0component0/lib2childlib0component0.component.html - 2,2s