Compare npm vs yarn
It installs two node.js projects (react & ghost) and shows how long it takes to do that under multiple scenarios (cold cache, installed and lockfile). It is automatically run each day by Travis. If the same version is published on multiple days an average will be calculated.
Charts available at https://docs.google.com/spreadsheets/d/1ZE5B4qJw1kNGMzjgslcWTuPYrpatzQJXSYMGNOhZ2ys/edit?usp=sharing