yarn add or yarn remove take too long on Windows

[kumarharsh]

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

BUG

What is the current behavior?
Running yarn add on my project (with about 120 dependencies) takes close to 20 minutes on Windows systems, but finishes rather quickly on Linux systems. On Windows, it seems to copy/install about 120k+ packages, as shown in the screenshot below. This happens on every yarn add/remove.

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

Please clone this repo: https://github.com/kumarharsh/yarn-bug, and run yarn install, and then yarn add react-helmet. On Windows, it takes ages to install/copy the package, and it happens everytime I run that command.

What is the expected behavior?

Yarn shouldn't take 20 minutes on every yarn add/yarn remove. npm install takes like 10 seconds.

Please mention your node.js, yarn and operating system version.
NodeJS: 6.9.2
Yarn: 0.18.1
OS: Windows 10 64-bit

[torifat]

Dupe #990

[kumarharsh]

@torifat thank you, I didn't see that issue earlier.

I'm still getting very bad performance on installation, and it's consistently bad. If the other issue (#990) was closed, and the performance problems remain, then what is the solution?

[sathishsoundharajan]

@kumarharsh Refer this issue (#2458), that i have opened for the same. Post your thoughts there.

[kumarharsh]

@bboysathish okay, will do.