$ npm i
from package.json: 3m 17s
from shrinkwrap: 2m 56s
$ yarn
from package.json: 1m 30s
from yarn.lock: 0m 54s
Project: 76 first level dependencies, npm-shrinkwrap.json (334Kb), yarn.lock (302Kb)
Machine: OS X 10.10.5, 1.5 GHz, 8GB, SSD
Internet connection: 100 Mbps