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Comment by X-Istence | Hacker News Reader

This is so completely and utterly wrong, unfortunately...

Yarn takes 12 seconds to install all of our node_modules, npm@5 (latest) takes over 12 minutes.

This made it completely and utterly untenable for our CI system, so we switched to yarn and shaved 12 minutes off our CI builds. It's been fantastic.

That's got to be down to caching. What's the difference if the yarn cache is cleared?

25 seconds when the yarn cache is cleared... downloading is not the slow part here.

Old results from about a month ago:

  npm 5.3.0: added 1991 packages in 538.289s  
  yarn v0.27.5: Done in 58.42s.