Super slow build time while updating to v8.0.0

[hugo-marello]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Previous versions were way faster, last compiled with 7.2.0

Description

Tryed to update my large angular application to version 8.0.0, but the build takes forever.

🔬 Minimal Reproduction

Create a v6 angular app and follow the instructions on https://update.angular.io to update it to v8.0.0 . Build the application with node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng build --prod --verbose --no-progress > log.txt

🌍 Your Environment

Angular CLI: 8.0.1
Node: 10.15.2
OS: linux x64
Angular: 8.0.0
... animations, cdk, common, compiler, compiler-cli, core, forms
... language-service, material, material-moment-adapter
... platform-browser, platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.1
@angular-devkit/build-angular     0.800.1
@angular-devkit/build-optimizer   0.800.1
@angular-devkit/build-webpack     0.800.1
@angular-devkit/core              8.0.1
@angular-devkit/schematics        8.0.1
@angular/cli                      8.0.1
@ngtools/webpack                  8.0.1
@schematics/angular               8.0.1
@schematics/update                0.800.1
rxjs                              6.5.2
typescript                        3.4.5
webpack                           4.30.0

Anything else relevant?
My guess is the angular-devkit/build-angular is the culprit, it was known to have caused slowness in the past. I've run the benchmark inside the webpack script, I've posted the first half hour of execution.
log.zip

[alialtun14]

Hi @hugo-marello. I have the same problem. But the interesting thing is that only two people (according to stockover veya github issue ) have met this problem so far.

#14604

[jocstech]

I have the same slow-compiling issues here when using angular 8

[alan-agius4]

Hi @hugo-marello,

Thanks for the information provided. However, let's keep this in a single thread being #13734

Thanks

[micobarac]

@alan-agius4, what does this problem have to do with single thread you mentioned? I have the same slow build times with Angular 8, too. Building for production seems like to be doing the job in two steps, first by creating javascript chunks and the second by doing SASS compilation.

[julianpoemp]

@alan-agius4 can you please reopen this issue? There are a lot of people having this problem.

I tried to find a solution, but nothing helps to get the fast building like in Angular 6. With Angular 6 the build --prod time was like 10 seconds and now its 64 seconds. That with this optimizations:

node --max-old-space-size=8000 ./node_modules/@angular/cli/bin/ng build --prod --aot=false --optimization=true --sourceMap=false --buildOptimizer=false

What can we do to get better build times?

[mcenkar]

What can we do to get better build times?

For me installing node-sass helped a lot

yarn add node-sass

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