AoTPlugin (webpack + watch) takes over 2 minutes to do asset optimization #2746

OS?

Windows 8.1

Versions.

v6.5.0

Parts of package.json

"@angular/common": "^2.0.2",
"@angular/compiler": "^2.0.2",
"@angular/compiler-cli": "^2.1.0",
"@angular/core": "^2.0.2",
"@angular/platform-browser": "^2.0.2",
"@angular/platform-browser-dynamic": "^2.0.2",
"@angular/platform-server": "^2.0.2",
"@ngtools/webpack": "^1.1.0",
"@types/chrome": "0.0.35",
"@types/core-js": "^0.9.34",
"@types/filesystem": "0.0.28",
"@types/jquery": "^2.0.33",
"@types/node": "^6.0.45",
"@types/requirejs": "^2.1.28",
"angular-cli": "^1.0.0-beta.17",
"angular2-router-loader": "^0.3.2",
"angular2-template-compiler": "^0.1.9",
"angular2-template-loader": "^0.5.0",
...
"webpack": "^2.1.0-beta.25",
"webpack-manifest-plugin": "^1.0.1",
"webpack-notifier": "^1.4.1",
"webpack-shell-plugin": "^0.4.3",
"webpack-vendor-chunk-plugin": "^1.0.0",

Repro steps.

It's a chrome extension that I created from scratch. It utilized Webpack 1.x at first, then onto Webpack 2.x. It uses TypeScript 2.x.

Basically I am just copying the files from the blacksonic angular2-aot-webpack repo..

His repo still uses ngtools.NgcWebpackPlugin and not AoTPlugin.

He also doesn't use @ngtools/webpack it seems.

        test: /\.ts$/,
        use: [
          'awesome-typescript?tsconfig=tsconfig.json',
          'angular2-template'
        ]

I am using this:

                {
                    test: /\.ts$/,
                    //exclude: [ /.*\.ngfactory\..*/ ],
                    use: ["@ngtools/webpack"]
                },

The log given by the failure.

Using the following

            new ngtools.AotPlugin({
                tsConfigPath: './tsconfig.aot.json',
                baseDir: path.resolve(__dirname, ''),
                entryModule: path.join(__dirname, 'app', 'www', 'starter', 'app', 'main') + '#MainModule'
            }),

Builds quickly (less than 5 seconds), but as soon as it finishes building, the watch mode in webpack triggers a recompile, where the below step is taking an incredibly long time the first time. Once this one is done, all the next recompiles are super-quick.

147198ms [0] asset optimization
19574ms [0] emitting

Mention any other details that might be useful.

This is the speed when commenting out the AoTPlugin:

488ms [0] chunk asset optimization
64ms [0] asset optimization
20ms [0] emitting

I have tried to reduce overhead of stuff in my config, but in the end we're talking like 5-10 entries, and barely any plugins..