[v4 beta-12]: perf: Build process is drastically slower

[lukeisontheroad]

Bug Report

Ionic Info (before upgrade)

Ionic:

   ionic (Ionic CLI)             : 4.2.1 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.0.0-beta.11
   @angular-devkit/build-angular : 0.8.5
   @angular-devkit/schematics    : 0.8.5
   @angular/cli                  : 6.2.5
   @ionic/angular-toolkit        : 1.0.0

System:

   NodeJS : v9.11.2 (/usr/local/lib/node_modules/node/bin/node)
   npm    : 6.1.0
   OS     : macOS

Ionic Info (after upgrade)

Ionic:

   ionic (Ionic CLI)             : 4.2.1 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.0.0-beta.12
   @angular-devkit/build-angular : 0.8.5
   @angular-devkit/schematics    : 0.8.5
   @angular/cli                  : 6.2.5
   @ionic/angular-toolkit        : 1.0.0

System:

   NodeJS : v9.11.2 (/usr/local/lib/node_modules/node/bin/node)
   npm    : 6.1.0
   OS     : macOS

Describe the Bug
After upgrading from beta 11 to beta 12, I noticed a big difference in compile time.

Before (4.0.0-beta.11):
[ng] ℹ ｢wdm｣: Compiling...
[ng]
[ng] Date: 2018-10-16T11:58:26.944Z - Hash: 100fa7e4d25e03303631 - Time: 8463ms
[ng] 173 unchanged chunks
[ng] chunk {tabs-tabs-module} tabs-tabs-module.js, tabs-tabs-module.js.map (tabs-tabs-module) 25.9 kB [rendered]
[ng] ℹ ｢wdm｣: Compiled successfully.

After (4.0.0-beta.12):
[ng] ℹ ｢wdm｣: Compiling...
[ng]
[ng] Date: 2018-10-16T12:04:02.336Z - Hash: 9a0c1949d63b849a7238 - Time: 74036ms
[ng] 173 unchanged chunks
[ng] chunk {tabs-tabs-module} tabs-tabs-module.js, tabs-tabs-module.js.map (tabs-tabs-module) 25.9 kB [rendered]
[ng] ℹ ｢wdm｣: Compiled successfully.

It's only an incremental change (color from light to dark in one of the components), but it almost takes as long as the initial compile duration.

Steps to Reproduce
Steps to reproduce the behavior:

1. ionic start myApp tabs --type=angular
2. ionic serve
3. wait for the first build
4. make a small change (i.e. tabs.page.html to )
5. check the complication time
6. downgrade "@ionic/angular": "4.0.0-beta.12" to "@ionic/angular": "4.0.0-beta.11"
7. repeat steps 2-5

Related Code
Starter project & my custom project

Expected Behavior
Similar build performance as before (at least not x10 times slower)

Additional Context
None

[jase88]

Update to Node 10 is right. Compiling time from 79s to 7s.

Duplicate of #15800 or #15644

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.