In a test case, Google loaded 36 random background tabs, and the battery life of the blank foreground label increased by 28%. With the 36 random background tabs and foreground labels (including YouTube videos), the battery life is 13% (36 minutes) better without throttling.
Apple Safari makes use of a 1-minute polling interval. Nevertheless lowering the polling limit will cause problems with web applications. Thus, Google is considering activating the new limit only after 5 minutes of inactivity. Also, it will consider allowing enterprise users to use the group policy for one year.