Studies show that a small slow-down in website responsiveness can cause a large drop in user satisfaction and engagement. That means lost eyeballs, and potentially lost sales. With increased mobile use in accessing sites users have slower CPUs, smaller caches, and less bandwidth.

Latency issues with the site’s front-end are rarely covered in tutorials on the web despite the fact that it accounts for more than 90% of the latency on 8 of the 10 largest sites.

In this talk, we'll cover the current issues regarding front-end performance, including unique concerns for users on mobile devices. We will introduce various ways to measure and solve front-end problems and demonstrate how some of them can be brought to bear on the Drupal sites that you build.