Another vague feature that appears in the report is that Android 8.0 will come with restricted background activities that would help keep down power usage of apps that run in the background. (nashvillechatterclass.com)
Now your device goes into lower power usage when you aren't using it and the screen is off, even if you're on the move. (amazon.in)
The smart mode will try to balance the between performance and power usage by the CPU. (phoneradar.com)