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https://issues.apache.org/jira/browse/CB-11022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234957#comment-15234957
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ASF GitHub Bot commented on CB-11022:
-------------------------------------

Github user vladimir-kotikov commented on the pull request:

    https://github.com/apache/cordova-lib/pull/423#issuecomment-208311472
  
    The config file transformations are already handled during both plugin 
add/rm and prepare. Consider the following code: 
[Api.js#L233-L237](https://github.com/apache/cordova-android/blob/master/bin/templates/cordova/Api.js#L233-L237).
 It calls `add_plugin_changes` from 
[ConfigChanges.js#L128](https://github.com/apache/cordova-lib/blob/master/cordova-common/src/ConfigChanges/ConfigChanges.js#L128)
 which:
      1. saves these transormations into `<platform>.json` for further usage and
      2.  applies these transformations immediately (see 
[ConfigChanges.js#L160](https://github.com/apache/cordova-lib/blob/master/cordova-common/src/ConfigChanges/ConfigChanges.js#L160)).
    
    So right now the only goal of calling `prepare` right after `plugin add` is 
to copy www files.


> Adding plugins prepares platforms, which is redundant and slow
> --------------------------------------------------------------
>
>                 Key: CB-11022
>                 URL: https://issues.apache.org/jira/browse/CB-11022
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: CordovaLib
>            Reporter: Jason Ginchereau
>            Assignee: Vladimir Kotikov
>
> For CB-9617, a change was made to automatically do a 'cordova prepare' 
> operation after adding every plugin. As part of the prepare, all the files 
> from the project's www directory are re-copied into the platform_www 
> directory. For a large project with lots of source files, images, and other 
> resources, this copy operation is potentially time-consuming. And it is 
> redundant and unnecessary when adding a plugin, because those files do not 
> need to be changed when adding a plugin.
> For a large project with many plugins, this slow redundant operation is 
> repeated for every plugin, making the first-time build (installing all the 
> plugins) take a very long time. As an extreme case, a customer reported their 
> large project (35 plugins, ~150 MB in www) takes about 2 hours to build the 
> first time. Most of that time is spent repeatedly preparing the platforms 
> after adding each plugin. The log line that appears to be slow says it is 
> "Generating config.xml from defaults for platform <platform>", but what it is 
> actually doing is redundantly copying lots of files from www.
> This issue can also be observed at a smaller scale when building the Cordova 
> mobilespec project, which contains tests for all the core plugins. 



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