Rebuild time is not stable anymore in 8.0.3

[kondi]

🐞 Bug report

Using @ngtools/webpack 8.0.3, every second rebuild time is high.

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, since 8.0.1. First appeared in 8.0.2 (see #14719), 8.0.3 aimed to fix it, but the fix is half-measure (literally).

Description

Launch ng serve, wait for the first build, then touch a component html file and wait its rebuild. I did this few times and wrote down the rebuild times.

Version 8.0.3:

Date: 2019-06-14T08:56:30.744Z - Hash: 1510132cb3f52964d65f - Time: 604ms
Date: 2019-06-14T08:56:38.832Z - Hash: ed253eed9ef804f511c4 - Time: 3532ms
Date: 2019-06-14T08:56:41.848Z - Hash: e6c08a5104db15d947e1 - Time: 515ms
Date: 2019-06-14T08:56:46.328Z - Hash: 09d3d86fec4c9a9a8834 - Time: 2672ms
Date: 2019-06-14T08:56:48.946Z - Hash: 097aa1913892c8c0686b - Time: 508ms
Date: 2019-06-14T08:56:54.344Z - Hash: 202a52c4a542a92a1b29 - Time: 2602ms
Date: 2019-06-14T08:56:57.124Z - Hash: 7f1ee6300d02717134b9 - Time: 483ms
Date: 2019-06-14T08:57:02.795Z - Hash: 0a543e91e63df3ef126b - Time: 2539ms

First rebuild is fast, but every second rebuild is slow.

Version: 8.0.2:

Date: 2019-06-14T09:07:16.760Z - Hash: 6097b75a6d66059ebe08 - Time: 3601ms
Date: 2019-06-14T09:07:21.965Z - Hash: 6da18789c4ba1a17e497 - Time: 3108ms
Date: 2019-06-14T09:07:26.492Z - Hash: d2ff2f0ddee4629d1873 - Time: 2975ms
Date: 2019-06-14T09:07:30.964Z - Hash: bfdb111a980b70d79663 - Time: 2650ms
Date: 2019-06-14T09:07:35.738Z - Hash: d561e16b9dbb24e847d9 - Time: 3048ms
Date: 2019-06-14T09:07:40.500Z - Hash: 5687d30b86313eef337f - Time: 2671ms
Date: 2019-06-14T09:07:45.331Z - Hash: 8a729cf663bdc716675f - Time: 2980ms
Date: 2019-06-14T09:07:50.294Z - Hash: 448f796097c1c2eca4a6 - Time: 2760ms

Every rebuild is slow.

Version: 8.0.1:

Date: 2019-06-14T09:10:33.650Z - Hash: 6097b75a6d66059ebe08 - Time: 606ms
Date: 2019-06-14T09:10:36.262Z - Hash: 6da18789c4ba1a17e497 - Time: 545ms
Date: 2019-06-14T09:10:38.651Z - Hash: d2ff2f0ddee4629d1873 - Time: 519ms
Date: 2019-06-14T09:10:40.835Z - Hash: bfdb111a980b70d79663 - Time: 514ms
Date: 2019-06-14T09:10:42.731Z - Hash: d561e16b9dbb24e847d9 - Time: 524ms
Date: 2019-06-14T09:10:44.932Z - Hash: 5687d30b86313eef337f - Time: 489ms
Date: 2019-06-14T09:10:47.433Z - Hash: 8a729cf663bdc716675f - Time: 642ms
Date: 2019-06-14T09:10:49.930Z - Hash: 448f796097c1c2eca4a6 - Time: 504ms

Every rebuild is fast.

🌍 Your Environment

@angular-devkit/architect                  0.800.3
@angular-devkit/build-angular              0.800.3
@angular-devkit/build-optimizer            0.800.3
@angular-devkit/build-webpack              0.800.3
@angular-devkit/core                       8.0.3
@angular-devkit/schematics                 8.0.3
@angular/cdk                               8.0.1
@angular/cli                               8.0.3
@angular/material                          8.0.1
@ngtools/webpack                           8.0.3
@nguniversal/express-engine                7.1.1
@nguniversal/module-map-ngfactory-loader   7.1.1
@schematics/angular                        8.0.3
@schematics/update                         0.800.3
rxjs                                       6.4.0
typescript                                 3.4.5
webpack                                    4.30.0

Anything else relevant?

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

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