Rebuild extremely slow

[asadsahi]

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   Windows 10

2. Versions. Please run ng --version. If there's nothing outputted, please run
   in a Terminal: node --version and paste the result here:
   angular-cli: 1.0.0-beta.11-webpack.8
   node: 6.3.0
   os: win32 x64

3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   app created with 1.0.0-beta.11-webpack.2 and later on upgraded to 1.0.0-beta.11-webpack.8 with appropriate changes.

4. The log given by the failure. Normally this include a stack trace and some
   more information.
   The slow behavious is observed when upgraded from 1.0.0-beta.11-webpack.2 to 1.0.0-beta.11-webpack.8

5. Mention any other details that might be useful.
   Slow behavious reproduceable in following repo:
   https://github.com/asadsahi/ng2fb-bootstrap

   ---

I have experience this on two operating systems, windows 7 and windows 10. Has anyone else experieced this? For me rebuilds are dramatically slow, taking roughly 7-8 seconds which on same machine with cli version webpack.2 was taking rougly 2-3 seconds.

[stellasoft-george]

+1 Rebuilds are extremely slow for me on OSX 10.11.6

[RicardoVaranda]

+1 also quite slow on linux x64 after I moved my assets from the app folder to the appropriate assets folder, it now optimizes the assets folder every time I make a change to any of the code which seems to be the reason for the added delay.

[filipesilva]

@TheLarkInn can you weigh in? It seems related with CopyWebpackPlugin.

I also have a very slow "chunk assert optimization" step (~8s all the time even for small changes in one file). looking at webpack/webpack#539 (comment) it seems it could be due to the source-map configuration chosen.