Yarn: Yarn unusually slow (slower than NPM) on MacOS Sierra, CRA-based project

[Connorelsea]

Firstly: Thank you all for your work on Yarn! I appreciate it. I just have a small issue and am wondering if I am doing something wrong.

Do you want to request a feature or report a bug?

Bug

What is the current behavior?
Yarn runs unusually slow (when installing yarn add ... new packages and when running yarn after rm -rf node_modules

If the current behavior is a bug, please provide the steps to reproduce.

This is my Yarn output:

This is my package.json (which shows my dependencies): https://gist.github.com/Connorelsea/91438f391215830dc32ac44b48bcb388

Runtime:
Yarn runs from 15:32:19 to 15:34:37
NPM runs from 15:35:30 to 15:36:48

What is the expected behavior?

For yarn to run faster. I just want to know if I am doing something incorrect here. I have installed all these packages before and assume they should be cached.

Please mention your node.js, yarn and operating system version.

MacOS: Sierra 10.12
Node: v6.5.0
Yarn: 0.16.1
NPM: 3.10.3

Just tried this again with yarn 0.18.1 and got similar behavior.

[janpieterz]

I have very similar, extremely slow, speed behavior on Windows with Yarn 0.18.1, on an already installed project simply adding one package.

It took 382.68s !

Os: Windows 10 Anniversary +
Node: v7.2.0
Yarn: 0.18.1

[Connorelsea]

Though I could be wrong, I saw some issues when searching with Windows specific problems, which may be the issue you are having @janpieterz . I am on MacOS Sierra