Opera has just done something like this for it's low power mode: Reduced activity in background tabs Waking CPU less often due to more optimal scheduling of J

Opera has just done something like this for it's low power mode: Reduced activity in background tabs Waking CPU less often due to more optimal scheduling of JavaScript timers Automatically pausing unused plug-ins Reduced frame rate to 30 frames per second Tuning video-playback parameters and forcing usage of hardware accelerated video codecs Paused animations of browser themes http://www.opera.com/blogs/desktop/2016/05/introducing-power-saving-mode/ http://www.opera.com/blogs/desktop/2016/05/introducing-power...