'npm install' extremely slow on Windows

Question

For me is npm install extremely slow. I\'m using Windows 8.1 with the latest npm version. My connection speed is around 100Mbit/s.

The project I\'m tryi

Answer 1

For me it appeared to be a problem with IPv6.

Disabling IPv6 helped immensely for me.
With IPv6 turned on "update-package newtonsoft.json" took 1:45 to time out with the error "update-package : A task was canceled."

With IPv6 disabled "update-package newtonsoft.json" completed in 10 seconds