[polymer-build] Polymer build so longgg

[RoXuS]

hi team !

For some unknown reasons our polymer build takes a very long time (70 min on my macbook, 190 minutes on gitlab ci!), We have the standard esm-bundled + es6-bundled + es5-bundled, someone have the same issue?

{
  "builds": [
    {
      "name": "esm-bundled",
      "browserCapabilities": [
        "es2015",
        "modules"
      ],
      "js": {
        "minify": true
      },
      "css": {
        "minify": true
      },
      "html": {
        "minify": true
      },
      "bundle": true,
      "addServiceWorker": true
    },
    {
      "name": "es6-bundled",
      "browserCapabilities": [
        "es2015"
      ],
      "js": {
        "compile": "es2015",
        "minify": true,
        "transformModulesToAmd": true
      },
      "css": {
        "minify": true
      },
      "html": {
        "minify": true
      },
      "bundle": true,
      "addServiceWorker": true
    },
    {
      "name": "es5-bundled",
      "js": {
        "compile": "es5",
        "minify": true,
        "transformModulesToAmd": true
      },
      "css": {
        "minify": true
      },
      "html": {
        "minify": true
      },
      "bundle": true,
      "addServiceWorker": true
    }
  ]
}

[dejan9393]

I'm also experiencing slow build times when building esm, es6 and es5 builds. Not 70 minutes long, usually ~12 minutes for some of our larger projects, decreased slightly by upping the amount of CPU power the machine we're building on has.

Stumbled upon this while while googling for an answer to whether or not polymer build builds in parallel by default or if I'd have to use the polymer-build package to manually handle having the builds running in parallel

[matthiasabele]

Same problem here... as soon as the build is bundled, it gets really slow. Did anyone find a solution for this? Our application is growing, and build time is skyrocketing (3h47min at the moment)

[dejan9393]

Personally, we've moved away from Polymer Build and are instead using rollup directly to bundle our application into "modern" and "legacy" builds. We're using packages from the @open-wc recommendations site - they provide you a base setup for building WebComponents for the web (https://open-wc.org/building/building-rollup.html#configuration) and other tools for building, developing & testing.
Build times are many times quicker, but it is a bit more setup than simply running polymer-build

[jogibear9988]

#3458

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