In Angular 8, rebuild time increased 5 times

[kondi]

🐞 Bug report

Command (mark with an x)

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

Is this a regression?

Yes. Fast edit-refresh cycle is important for efficient development and good developer experience. These numbers are on an i7 8700k, 4.70 GHz, 6 cores. On an i5 laptop, this is much worse.

Description

I am launching ng serve, wait for the first build, then simply add a character to a component html and wait for its rebuild.

Angular 7 with node 10 numbers:

Initial build time: 20277ms

Date: 2019-06-12T08:45:40.442Z - Hash: 798d6268d0081779e433 - Time: 3906ms
Date: 2019-06-12T08:45:44.915Z - Hash: f2261bf0f4c989aafd45 - Time: 713ms
Date: 2019-06-12T08:45:49.619Z - Hash: b1d9acd1ba005e02d16a - Time: 686ms
Date: 2019-06-12T08:45:53.047Z - Hash: a61cd4f8957f38c022b4 - Time: 626ms
Date: 2019-06-12T08:45:56.484Z - Hash: b7a19671b191125819c2 - Time: 636ms
Date: 2019-06-12T08:45:59.639Z - Hash: 7c9c0bce292d15ef2cd3 - Time: 569ms

Except for the first rebuild, the avg is 646 ms.

Then I upgrade to angular 8 by following https://update.angular.io/#7.0:8.0

Angular 8 with node 12 numbers:

Initial build time: 19749ms

Date: 2019-06-12T09:28:45.682Z - Hash: 75800fbf7877bb95d0d2 - Time: 6748ms
Date: 2019-06-12T09:28:52.409Z - Hash: 23e65c2b0fce1a3361a1 - Time: 4369ms
Date: 2019-06-12T09:28:58.482Z - Hash: 84b7dd3bad28fba0fdf2 - Time: 3301ms
Date: 2019-06-12T09:29:03.940Z - Hash: 0c71ad6034ff26149d83 - Time: 3148ms
Date: 2019-06-12T09:29:09.120Z - Hash: 99eec27b6f1cbaf2cfc9 - Time: 3052ms
Date: 2019-06-12T09:29:14.325Z - Hash: 286940db558cc2daef0c - Time: 3067ms

Except for the first rebuild, the avg is 3387 ms.

If I skip the node upgrade, angular 8 with node 10 numbers:

Initial build time: 22310ms

Date: 2019-06-12T09:47:13.472Z - Hash: ea5ee2c476dbd8c936b7 - Time: 4383ms
Date: 2019-06-12T09:47:19.800Z - Hash: b4743902c21eb978d7ce - Time: 3028ms
Date: 2019-06-12T09:47:25.326Z - Hash: 99614fb778701ac8b76d - Time: 2766ms
Date: 2019-06-12T09:47:32.048Z - Hash: 71ce551c8d9a33219f5e - Time: 2935ms
Date: 2019-06-12T09:47:38.543Z - Hash: 57c68cb3f0fd65b07920 - Time: 2635ms
Date: 2019-06-12T09:47:44.753Z - Hash: df1234ad69d85c40ebc2 - Time: 2971ms

Except for the first rebuild, the avg is 2867 ms.

🌍 Your Environment

Angular CLI: 8.0.2
Node: 12.4.0
OS: win32 x64
Angular: 8.0.0
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router

Package                                    Version
--------------------------------------------------------------------
@angular-devkit/architect                  0.800.2
@angular-devkit/build-angular              0.800.2
@angular-devkit/build-optimizer            0.800.2
@angular-devkit/build-webpack              0.800.2
@angular-devkit/core                       8.0.2
@angular-devkit/schematics                 8.0.2
@angular/cdk                               8.0.1
@angular/cli                               8.0.2
@angular/material                          8.0.1
@ngtools/webpack                           8.0.2
@nguniversal/express-engine                7.1.1
@nguniversal/module-map-ngfactory-loader   7.1.1
@schematics/angular                        8.0.2
@schematics/update                         0.800.2
rxjs                                       6.4.0
typescript                                 3.4.5
webpack                                    4.30.0

Anything else relevant?

Sass: yes, fibers is installed
Operating system: windows 10

[kondi]

Might be related to #14604 or #13734, but the initial build times are not worse, this is mainly about a rebuild time regression of a non-production build by ng serve.

[clydin]

Fixed on master and will be in the next patch release.

Dupe of #14719

[micobarac]

I have the same problem with Angular 8. I hope the fixed version will be out soon.

[kondi]

@micobarac Fix is already in @angular/cli v8.0.3, however it has #14775. Probably its fix will be released as well this week in v8.0.4.

[adripanico]

Let's wait to cli 8.0.4 then, I notice some improvement, but not enough: #14604 (comment)

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