This is great news!  I’ve often noticed Chrome eating up a ton of CPU cycles in the background (and thus using battery when mobile) so this should make a big difference!

Rejoice, Chrome users! With Chrome 57, released this week, your laptop might soon get more than three hours of battery life when you have multiple tabs open.

In September last year, the Chromium team said changes were coming to Chrome’s handling of background tabs, but the changes have landed in the stable branch of Chrome a little sooner than expected. Basically, from now on, background tabs will be limited to an average CPU load of just 1 percent on a single core.

Source: Chrome 57 restricts background tabs to 1% CPU, prolonging battery life | Ars Technica