Angular 18.1.2 (core/cli) build 4 to 6 times slower then Angular 17.3.12 (core)/17.3.8(cli) #57287

Command

build

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

17.3.8

Description

when we moved our product from angular 17.3.x to angular 18.1.x the build time increased a lot (its kind of what i guess it was before the nice new application builder)

17: Application bundle generation complete. [10.941 seconds]

18: Application bundle generation complete. [67.430 seconds]

also the cpu seems to spike a lot, and also memory useage seems to go through the roof. (maybe that last part is the problem)

it checked what the update from 17->18 really did, but there are not really any changes in the angular.json or tsconfig files.
The only thing that really changed in angular.json was the move for @nagular/localize/init (to the polyfills array)

Servoy/servoy-eclipse@168148f

Minimal Reproduction

i have created 2 dumps of pretty much the same code:
17.zip: https://drive.google.com/file/d/101jGhs4Ujdrb59MbA45CM8X9RHYOoVMh/view?usp=sharing
18.zip: https://drive.google.com/file/d/1PrykSeOWgokdfe29ta0wlkxCRIMSBr-Z/view?usp=sharing

if those are unzipped into there own dirs
then in the root dir "npm install" in the sub "Test" dir "npm install"
then run "npm run build_lib_debug_nowatch" once in the Test sub dir

and then you can run "npm run build_debug_nowatch"
then for me on my local system the one from 17 is around 11 seconds and the one from 18 is around 48 seconds

I did track it down because of the 2 extra packages we install, those are in the packages@servoy directory
it really seems to be related to that, adding more of this (and especially those 2) seems to add a lot of time.

Exception or Error

around the same build time as 17 .

Your Environment

Angular CLI: 18.1.2
Node: 20.16.0
Package Manager: npm 10.8.1
OS: win32 x64

Angular: 18.1.2
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1801.2
@angular-devkit/build-angular   18.1.2
@angular-devkit/core            18.1.2 (cli-only)
@angular-devkit/schematics      18.1.2 (cli-only)
@schematics/angular             18.1.2
ng-packagr                      18.1.0
rxjs                            7.8.1
typescript                      5.5.4
zone.js                         0.14.8

Anything else relevant?

No response